Self-locking tool

Abstract: The locking tool of this invention comprises in one embodiment three or more pieces (2, 3, 4). All three pieces are connected together with an axle pin (15). A first handle piece (2) has one or more arc-like slots (7) which criss-cross with one or more slots in a second handle piece (3). A third piece (4) called a jaw piece has a generally radial slot (10) that is coextensive with the other two slots. A locking pin (8) is movably positioned in and through the three slots. When pressure is exerted upon the handles (12, 13) of the two handle pieces, this locking pin (8) is tilted against the walls of the slots to lock the jaws of the tool in position. When pressure is exerted on the handles, the slots can leverage the pin both rotationally and radially. Resistance to the pin movement either radial or rotational causes the pin to be tilted against the walls of the slot in such positions as to preclude natural reversed movement of the pin as in a one-way valve.

Description: This invention relates to a locking tool and, more particularly, to a tool that will lock an object in place upon the application of pressure. It is known to use various tools for holding and locking work objects in place. A tool corresponding to the preamble of claim 1 is disclosed in US-A- 2,370,308. There are other tools which utilize connecting parts that are rotatable upon a common axis. Some of these tools are disclosed in US-A- 682,701; 644,825; 1,026,270; 1,401931; 1,450,875; 1,717,726; 2,574,909 and 4,633,558. In US-A- 682,701 (Howland) a locking pliers is disclosed having a plurality of pieces movable along a multitude of pivot points. There is a central pivot A having 5 or 6 separate pieces movable thereabout. When the pliers of Howland is in the locked position an object is held between jaws B and C which are in turn pivotally connected to D, H, J and r. Howland's device is relatively complex in usage and construction. Both handles of Howland's also must be held at all times during use in order to maintain an object locked in position. Also, Howland requires a high friction surface to function properly. US-A- 644,825 (Jensen) discloses a wrench having handle means that can be locked in place by a spring means n. The spring is positioned on the bottom portion of one of the handles. When pin g of Jensen is pressed out of the socket h, it is slid into the socket i and spring n holds it in place. The holding device of Jensen is again relatively complex in construction and would be relatively expensive to manufacture. US-A- 1,026,270 (Leonard) discloses a pipe wrench with a holding device to permit the wrench to be applied to a pipe or rod. A spring 15 in Leonard engages the handle 13 and its opposite end is secured to the shank of the wrench. The spring 15 locks the handle in position between the jaws 5 and 6. As in many locking tools, Leonard relies upon a spring means to provide the locking mechanism in his device. In US-A- 1,401,931 (Whelan) an adjustable pipe wrench is disclosed which uses a quadrant attachment element together with two jaws to hold an object in position. The wrench of Whelan holds pipes or the like of various diameters with a three point grip, each of the three elements having a gripping surface. US-A- 1,717,726 (McGill) and US-A- 2,574,909 (Burrows) each disclose wrenches having holding means to tightly hold items. Each discloses a wrench having several parts and several focal points for each part. Included in both patents are adjusting means to tighten or loosen objects held within the jaw assemblies of the respective wrenches. In US-A- 1,450,875 (Teselsky) a pliers is disclosed having a third jaw section that will coact with the other two jaws of the pliers to prevent the article gripped from slipping. Handle means 5 and 6 of Teselsky each terminate with a jaw section, these jaw sections have a shank mounted around the exterior portion of one of the jaws. This shank acts as a third jaw which coacts in a gripping operation. US-A- 4,633,558 (Spaulding) discloses a tool for applying a spring clamp to an object. Spaulding utilizes a cam which is carried by one of the jaws and a pair of side plates pivotally supported by the other of said jaws having cam control tracts therein for affecting and controlling radial movement of said cam to complete closure of said clamp. There are means on a jaw for controlling rotation of the cam and the cam is engaged to a hook portion to the spring clamp to effect closure. All of the above prior art devices are relatively complex in structure, most require springs for a locking effect and several are complicated to use. There is a need for a relatively simply-constructed tool that will lock an object in position without the need for springs or other such means. It is therefore an object of this invention to provide a locking tool which is devoid of the above-noted disadvantages, and which is relatively easy to use yet effective in holding an object securely. According to the present invention, there is provided a locking tool comprising at least three pieces, two of which are handle pieces, and two of which co-operate to hold an object, the three pieces being pivotally connected by a pivot pin passing through a pivot hole in each piece, characterised in that two of the pieces each have an arcuate slot spaced from the pivot hole and the third piece has a slot spaced from and extending generally radially of, the pivot hole, that a locking pin passes through all three slots, and that on operating the tool so that an object is gripped thereby, the locking pin is tilted to a position which is not parallel with the pivot pin, thereby locking the tool. The locking tool of the invention is relatively simple in construction and relatively inexpensive to use. It has a cam leverage advantage either as a primary pressure applying force or as a secondary function to tilt and thereby lock the tool. The tool has two handle means wherein only one needs to be held after pressure has effected a locking of the object. It can be used to easily lock and release an object held therein. The tool has means to lock in four directions; rotationally counter-clockwise, clockwise and radially in and out. Once the lock is effected, handle pressure can be released without affecting the lock. In one embodiment of the invention, the tool comprises in combination two handle pieces and a jaw piece. The first of the handle pieces has an axle aperture through which it is connected to the other two pieces via their axle apertures. A pin or other suitable means is extended through the three apertures and closed at both ends to movably fix the pin in position. All three pieces will rotate around the pin which acts as the focal point for the locking tool. The axle apertures and axle pin can be located on a plane above or below the arc-like slots described hereinafter. The first handle piece has a jaw at its upper end opposite the handle grip section of the piece. Below the jaw in the first handle piece is the axle aperture and below (or above) the axle aperture is an arc-like slot. The second handle piece has no jaw at its upper end but contains an axle aperture and below (or above) this aperture is positioned an arc-like slot. The third or jaw piece has no handle but contains a jaw section which is complementary to the jaw in the first handle piece and forms a gripping means therewith. The term "jaw" throughout this disclosure and claims will include any gripping surface The arc-like slots can be in the handle portions, or in another embodiment, one can be in the third piece. Conversely, the radially-extending slot can be in one of the handle pieces. In a preferred embodiment, below the jaw section of this third piece is the axle aperture and below (or above) the axle aperture is a generally radially-extending slot. By a "generally radially extending slot" is meant throughout this disclosure and claims a slot that varies from exactly radial to about 25° from the radial when measured from the direct center of the axle aperture. A locking pin extends through the slots of all three pieces and is movable through the entire slots when in use. A plurality of slots can be used thereby allowing any slot-to-axle positioning (top, bottom or side). The arc-like slots in the first and second handle pieces spiral in opposite directions (as shown in Figure 3 described below). When the first and second handle pieces are stacked adjacent each other (or alternatively stacked together with the third or jaw piece) the spiraling slots overlap each other to form a diamond-shaped opening. The locking pin extends through this diamond-shaped opening. When the handle pieces spin around each other, the slot walls push the pin by touching the pin with two adjacent sides of one of the four diamond corners. The application of a squeezing pressure on the two handles with a resisting force affecting the pins will move or force the locking pin to tilt since the pin is not supported at the other end of the stacked pieces. When the locking pin tilts, it locks the jaws together thereby holding an object securely between the jaws. At all times the locking pin is movably extended through the three slots in the first and second pieces and the third jaw piece. To release an object locked between the jaw sections the user actively forces the handle pieces apart causing the pin to straighten thereby releasing the lock and the object will fall loose. As the arc-like slots in the first and second handle pieces cross each other during use, they form an X-like configuration with each other and thereby form a diamond-like opening at their point of overlap or point of crossing. During use, the locking pin travels in an arc-like motion in the handle slots while it travels in an up-down motion in the jaw piece slot. When the handle parts are pressed together, the locking pin travels up the jaw piece slot toward the axle pin. The locking pin will lock in both a radial and in a rotational direction. All of the slots in the three pieces should have a width dimension slightly more than the diameter of the locking pin to permit it to be freely movable therein. In a preferred embodiment of the invention one slot is used in each of the three pieces, however, more than one slot in each can function equally well. It is important, however, that the arc-like slots whether one or several in the first and second handle pieces be positioned so that they spiral in the opposite direction to the corresponding slot in the adjacent handle piece. These slots can be concave (as shown in figures 1-5) or convex, if desired. Each of these corresponding slots must form an X-like pattern when they cross and form a diamond-like opening which is common to both slots. The slots in the jaw piece will be substantially vertically disposed and in alignment with each of the plurality of slots in the handle pieces. The locking pin, when the locking tool is in the unlocked mode, will be substantially horizontal, but when in a locked mode will be tilted off horizontal against at least one side of each slot or diamond wall, pointed at one corner of the diamond hole or aperture. This causes the locking effect of this invention. While there can be one slot or a plurality of slots in each of the three pieces, there must be at least one slot in each piece and at least one axle pin and at least one locking pin. Also, if desirable, the substantially radial slot(s) can be in a handle piece and the arc-like slots in the other handle piece and third piece. Regardless whether the handle pieces are rotated against the pin or the pin is pushed externally against the pieces, when blocking occurs the pin tilts. Since there is nothing to hold the pin parallel to the axle, the pin begins to tilt in the direction of the force on the pin whether the external force on the pin or the blocking against the pin moving, from the rotation of the handle pieces. Tilt occurs when the pin slides down the closest top or bottom slot wall; the pin attempts to fall down into this closest slot. It continues to fall until the opposite end of the pin hits the opposite two adjacent sides of the diamond hole. The opposite end of the pin then attempts to raise into its nearest slot (toward the original force in a reversed direction). Once it touches these slot edges the pivot begins. The points actually contacted along all four diamond walls are such that they closely balance or neutralize each other. The pin force directed at one corner equals the opposite reaction force at the opposite end of the pin in the opposite direction at the opposite diamond corner. While the locking pin remains parallel to the axle (even), the pin, if forced externally, would push toward one of the four corners on two adjacent sides of the diamond-shaped hole. This would begin to rotate the handle pieces in opposite directions to each other as the pin plows along the walls of the slot. Usually (and especially with a pin of a much smaller diameter than the slot width) the opposite corner of the diamond hole with its two adjacent sides are not affected at all. These two walls rotate along with the affected two walls usually not even touching the pin. When the pin becomes tilted, the pin can still plow toward a corner against its two adjacent walls but now the pin tilt has the opposite end of the pin touching the opposite adjacent walls. If the pin is externally pushed further, it begins to rotate the handle pieces. The opposite corner and its two walls now have no room or clearance to slide rotationally around the pin. The walls are blocked by the diameter of the pin being in a tilted shape and contacting said pin around and behind the circumference of the pin. The pin is held in position by the blocking force in one direction and by the opposing walls (one on each of the two plates) in the other direction. Additional force would only tend to tilt the pin more making the opposite two adjacent walls more blocked to a release rotation. In a second embodiment all three pieces have an axle aperture through which they are connected to the other two pieces. A pin or other suitable means is extended through the three apertures and closed at both ends to movably fix the pin in position. All three pieces will rotate around the pin which acts as the focal point for the locking tool. The axle apertures and axle pin can be located on a plane above or below the slots described hereinafter. The first and second handle pieces have jaw portions at their upper end opposite the handle grip section of the piece. Below the jaw portion in the handle pieces is an axle aperture and below (or above) the axle aperture in the first handle piece is an arc-like slot. The second handle piece has a jaw portion at its upper end and contains an axle aperture below said jaw portion. Below said jaw portion in said second handle piece is positioned a radially-extending slot. This second handle piece with the radially-extending slot is sandwiched between the first handle piece and the third or remaining piece when the tool is assembled. The third or remaining piece has a short handle and contains an arc-like slot which spirals in the same direction as the arc-like slot in the first handle piece. The term "jaw" throughout this disclosure and claims will include any gripping surface. The arc-like slots can be of any dimension as long as they spiral in the same direction and are of approximately the same dimensions and configuration, i.e. arc radius, etc. In a preferred embodiment the locking tool comprises three movably-connected pieces; a first handle piece, a second handle piece and at least one third piece. The first handle piece has an upper jaw portion, below said jaw portion an axle aperture and at least one arc-like slot positioned at a point below said axle aperture. The second handle piece has an upper jaw portion and below said jaw portion an axle aperture, and below said axle aperture at least one vertically-disposed slot. The third piece has an axle aperture and below said axle aperture at least one arc-like slot. The third piece is normally held in alignment with one of the handle pieces by holding the handles together as will be later shown in the drawings. The arc-like slots in said first handle piece and said third piece are about the same size and will spiral in the same directions when said first handle piece and said second handle piece and said third piece are assembled in said locking tool. The jaw portions in said first and second handle pieces are complementary jaw portions that cooperate to form thereby a gripping means. A locking pin is positioned through each of said arc-like and radially-extending slots. The arc-like slots in the first handle piece and third piece spiral in the same directions. When the first and second handle pieces are stacked and assembled with the third remaining piece, the spiralling slots are of approximately the same size, spiral in the same direction, have substantially the same arc-radius and are substantially identical in configuration. They must be aligned in at least a portion with the opening of the radially-extending slot in the second handle piece so that a locking pin can fit in an opening therethrough. The locking pin extends through the slots in the three pieces and through this opening. When the handle pieces spin around each other the slot walls push the pin by touching the pin with two adjacent sides of each of the arc-like slots. The rotation of the third piece, in the direction counter to the rotation that the second piece is being pressed against the first piece, will misalign the arc slots. This misalignment will move or force the locking pin to tilt since the pin is not supported at the other end of the stacked pieces. When the locking pin tilts, it locks the jaws together thereby holding an object securely between the jaws. At all times the locking pin is movably extended through the three slots in the first and second handle pieces and the third piece. To release an object locked between the jaw sections the user rotates the third piece relative to the first piece, back into position aligning the arc slots over each other thereby allowing the pin to straighten thereby releasing the lock and the object will fall loose. During use, the locking pin travels in an arc-like motion in the arc-like slots while it travels in an up-down motion in the radially-extending slot. When the handle parts are pressed together, the locking pin travels up the radially-extending slot toward the axle pin. The locking pin will lock in both a radial and in a rotational direction. All of the slots in the three pieces should have a width dimension slightly more than the diameter of the locking pin to permit it to be freely movable therein. In a preferred embodiment of the invention one slot is used in each of the three pieces, however, more than one slot in each can function equally well. It is important, however, that the arc-like slots whether one or several in the first handle piece and the third piece be positioned so that they spiral in the same direction. These arc-like slots can be concave or convex, if desired. The slot or slots in the second handle piece will be substantially vertically disposed and in alignment with each of the plurality of slots in the other two pieces. The locking pin, when the locking tool is in the unlocked mode, will be substantially horizontal, but when in a locked mode will be tilted off horizontal against at least one side of each arc-like slot. This causes the locking effect of this invention. While there can be one slot or a plurality of slots in each of the three pieces, there must be at least one slot in each piece and at least one axle pin and at least one locking pin. Regardless whether the handle pieces are rotated against the pin or the pin is pushed externally against the pieces, when blocking occurs the pin tilts. Since there is nothing to hold the pin parallel to the axle, the pin begins to tilt in the direction of the force on the pin whether the external force on the pin or the blocking force against the pin moving, from the rotation of the handle pieces. Tilt occurs when the pin slides down the closest top or bottom slot wall; the pin attempts to fall down into this closest slot. It continues to fall until the opposite end of the pin hits the opposite two adjacent sides of the diamond hole. The opposite end of the pin then attempts to raise into its nearest slot (toward the original force in a reversed direction). Once it touches these slot edges the pivot begins. The points actually contacted along the slot walls are such that they closely balance or neutralize each other. The pin force directed at one wall equals the opposite reaction force at the opposite end of the pin in the opposite direction at the opposite wall. While the locking pin remains parallel to the axle (even), the pin, if forced externally, would push toward one of the walls on at least two adjacent sides of the slots. This would begin to rotate the handle pieces in opposite directions to each other as the pin plows along the walls of the slot. These two walls rotate along with the affected two walls usually not even touching the pin. When the pin becomes tilted, the pin can still plow toward a corner against its two adjacent walls but now the pin tilt has the opposite end of the pin touching the opposite adjacent walls. If the pin is externally pushed further, it begins to rotate the handle pieces. The opposite corner and its two walls now have no room or clearance to slide rotationally around the pin. The walls are blocked by the diameter of the pin being in a tilted shape and contacting said pin around and behind the circumference of the pin. The pin is held in position by the blocking force in one direction and by the opposing walls (one on each of the two plates) in the other direction. Additional force would only tend to tilt the pin more making the opposite two adjacent walls more blocked to a release rotation. The tool of this invention rather than using one slot in each handle piece (as shown in the figures) can use a plurality of slots such as a multitude of arc-like slots as shown in figures 5A-5F of the present application. These arc-like slots would be disposed around an axle aperture and would allow several locking pins to travel in these arc-like slots. This or any other suitable arrangement may be used using the general concept to augment the rotational and radial aspects of this invention. The tool of this invention can be used in hand tools such as pliers or wrenches or in vices, other gripping devices, hinging devices with position locking and as a differential clutching or locking device to the relative speeds of rotation of the plates. The present disclosure describes the lock as occuring when the pins tilt towards one of the four corners created when the first and second plate, with curved slots, overlap. Diagram 4a and b presents only these two plates and a pin in describing the locking action. When describing the socket and its action, the third plate is seen as functioning in the rotation pliers action. The rotational and radial aspects are independent (jaws not needed). In the radial action, the slots of plate three are merely guides while the pin and wedges, cause and maintain the locking action. This locking action is described as outward/inward, riding within the radial slots of plate three. Since the two aspects (wedges and slots) are both primarily radial, the slots could serve only to possibly maintain a radial stability of the pins. The size of the pins and thickness of the curved slots and the stability of the socketed object or force can maintain this radial stability themselves making the actual slots of plate three unnecessary in the socket type lock. Various embodiments of a locking tool in accordance with the present invention will now be described, by way of example, with reference to the accompanying drawings, in which: Figure 1 is a plan side view of a first embodiment of the assembled locking tool of this invention. Figure 2 including figures 2A - 2E illustrate a side plan view of the disassembled main component parts or pieces of the locking tool of figure 1. Figure 3 is a top plan breakaway view of the interaction of the slots in the handle pieces of this invention showing the X-configuration and diamond-shaped opening. Figure 4 is a cross-sectional view of the figure 1 embodiment showing in 4A the position of the locking pin in a normal condition, and in 4B the position of the locking pin in a locked condition. Figure 5 including figures 5A - 5F illustrates a side plan view of an embodiment of this invention having a plurality of slots and locking pins. Figures 5A - 5D are side plan views of the disassembled component parts in this embodiment, and figure 5F is a side plan view of the assembled tool made up of components of figure 5A - 5D. Figure 6 including figures 6A - 6C is a side plan view of the disassembled component parts or pieces of another embodiment of the locking tool of this invention. Figure 7 is a plan side view of an alternative embodiment of the assembled locking tool of this invention. Figure 8 including figures 8A - 8E illustrate a side plan view of the disassembled main component parts or pieces of the locking tool of figure 7. Figure 9 is a top plan breakaway view of the interaction of the slots in the handle pieces of the figure 7 embodiment showing a similar spiral in the arc-like slots. Figure 10 is a side schematic cross-sectional view of the figure 7 embodiment showing in 10A the position of the locking pin in a normal condition and in 10B the position of the locking pin in a locked condition. In figure 1 the locking tool 1 of the first embodiment of this invention is illustrated in its assembled condition. The tool 1 comprises in this embodiment three main component pieces, a first handle piece 2, a second handle piece 3 and a jaw piece (third piece) 4. The first handle piece 2 has in its upper portion a jaw section 5, and below the jaw section 5 an axle aperture 6 (see figure 2). Below the axle aperture 6 in first handle piece 2 is a first slot 7 through which a locking pin 8 will travel. Locking pin 8 will also travel in and extend through a second slot 9 in second handle piece 3 and a third radially-extending slot 10 in jaw piece 4. Locking pin 8 will move as handles in handle pieces 2 and 3 are moved together or pushed apart. When an object is placed between jaw sections 5 and 11 and handles 12 and 13 are squeezed together, locking pin 8 travels or moves in an arc-like fashion through slots 7 and 9 and moves up or down in vertical slot 10. As jaws 5 and 11 are closed upon and grip an object and closing pressure is exerted upon handles 12 and 13 locking pin 8 is tilted off its original horizontal position and pushes up against or wedges against the walls of the slots 7 and 9 to thereby lock the jaws 5 and 11 in position. When slots 7 and 9 cross or overlap each other in an X-like fashion (see figure 3) they form a diamond-like opening 14 (of figure 3). Locking pin 8 at some point along its length wedges against the walls of this diamond-like opening 14 when the pin 8 locks in position. An axle pin 15 provides the focal point around which all of the pieces 2, 3 and 4 rotate in use. Axle pin 15 is disposed substantially horizontally through all three pieces 2, 3 and 4 via the apertures 6, 16 and 17 respectively. When locking pin 8 is in its normal condition (unlocked) it will be substantially parallel to the horizontally-disposed axle pin 15. When locking pin 8 is forced against the walls of slots 7 and 9 in a locked position, it will tilt away from its parallel position to axle pin 8. Regardless whether pieces 2 and 3 are rotated via axle pin 15 against the locking pin 8 or the pin 8 is pushed externally against the pieces 2 and 3, when locking occurs the locking pin 8 will tilt. Since there is nothing to hold the pin 8 parallel to the axle pin 15, the pin 8 begins to tilt in the direction of the force on the pin 8 whether the external force on the pin 8 or the blocking force against the pin 8 moving, from the rotation of pieces 2 and 3. Tilt of pin 8 occurs when the pin 8 slides down the closest top or bottom slot 7 or 9 walls. It continues to fall until the opposite end of the pin 8 hits the opposite two adjacent sides of the diamond opening 14 (see figure 3). The opposite end of the pin 8 then tends to raise into its nearest slot (toward the original force in a reverse direction). Once pin 8 touches these slot 7 and 9 edges, the pivot or tilt of pin 8 begins. The pin 8 force directed at one corner of diamond opening 14 equals the opposite reaction force at the opposite end of the pin in the opposite direction at the opposite diamond 14 corner. In figure 2 the three component pieces 2, 3 and 4 of locking tool 1 are illustrated. The first handle piece 2 has a jaw section 5 at its upper terminal end and a handle section 12 at its opposite terminal end. Below the jaw section 5 is an axle aperture 6 through which axle pin 15 extends when the tool 1 is assembled. Below axle aperture 6 is positioned an arc-like slot 7 through which locking pin 8 will extend when tool 1 is assembled. Slot 7 has a width just slightly (enough for pin 8 to be freely movable therein) greater than the diameter of pin 8. Slot 7 is disposed on first handle piece 2 in a manner such that when assembled and stacked with the other two pieces 3 and 4, it will form an X-like configuration and a diamond opening 14 with slot 9. Jaw section 5 will form the grip when it moves toward complementary jaw section 11. In second handle piece 3 the upper section of piece 3 has an axle aperture 16 which will house axle pin 15 when pin 15 extends through the axle apertures 6, 16 and 17 in pieces 2, 3 and 4 respectively. Below aperture 16 in piece 3 is an arc-like slot 9 which will criss-cross with slot 7 when in a stacked assembled relationship. Any stacking order of parts 2, 3 and 4 can be accomplished as long as the intended locking effect is accomplished. In the third piece or jaw piece 4 a jaw section 11 is provided which will form a biting or gripping section with jaw section 5 on first handle piece 2. Below jaw section 11 is provided an axle aperture 17 which will receive and house, together with aligned apertures 6 and 16, the pin 15. Below aperture 17 is a substantially radially-extending (when assembled as in figure 1) slot 10 that will house, together with slots 7 and 9, the locking pin 8. When the term "generally radially-extending" or "radially-extending" is used throughout this disclosure it is meant that the axis of slot 10 is from 0-25° off from a line drawn radially from the center of aperture 17. The slot 10 in figure 2 is drawn at an angle of about 14° off from a pure radial line from the center of aperture 17. Pins 8 and 15 are shown having bevelled edges at their terminal ends, however any type bolt, screw, rod or the like can be used as long as it is freely movable in slots 7, 9 and 10 (in locking pin) or can suitably act as an axle pin 8. In figure 3 a top breakaway view of the pieces 2, 3 and 4 is illustrated. Shown in figure 3 is the X-like pattern formed by slots 7 and 9 which criss-cross to form diamond opening 14. It is through this diamond opening 14 that locking pin 8 wedges when jaws 5-11 are tightened against an object to be held. When handle sections 12 and 13 are pushed together jaw sections 5 and 11 are pressed against an object to be held and the pressure exerted thereon will cause pin 8 to tilt against the walls 14 and lock the jaws 5 and 11 in place. To release the lock effect, handle sections 12 and 13 actively straighten the pin by being spread apart and locking pin 8 will be released from its locking mode against the walls of diamond opening 14. In figure 4 a side schematic view shows in 4A the locking pin 8 in an unlocked position which is parallel to axle pin 15. First, handle piece 2 is shown stacked against handle piece 3 wherein slots 7 and 9 are substantially perfectly aligned. Locking pin 8 is freely movable in slots 7 and 9 until a locking pressure is exerted upon handle sections 12 and 13 whereupon locking pin 8 becomes distorted from parallel and is tilted against the walls of slots 7 and 9 (or diamond opening 14) to hold both first and second handle pieces 2 and 3 in a locked position as shown in figure 4B. Axle pin 15 remains substantially in place throughout the locking and unlocking process but locking pin 8 is distorted from parallel when locked. In figures 5A - 5F another configuration of the locking tool is illustrated. Rather than using one slot in each handle piece as shown in the previous figures, a plurality of slots such as slots 18 can be used in first handle piece 19 of figure 5A. These slots 18 would be disposed around an axle aperture 20 and would allow four separate locking pins to travel in slots 18. As shown in figure 5B, complementary slots 21 would be positioned in second handle piece 22 and would be positioned so each slot 21 would criss-cross with its corresponding adjacent slot 18 to form a plurality of diamond-shaped openings 14 (as shown in figure 3). These slots 21 would also be disposed around an axle aperture 23. The third piece 24 (as shown in figure 5C) would house radial slots 25 which would function in a similar manner to radial slot 10 shown in the earlier figures. Also located in piece 24 is a centrally-disposed axle aperture 26 which is aligned with apertures 20 and 23 when the tool is assembled. An axle pin then would be extended through each aperture 20, 23 and 26. In this embodiment, jaws 27 and 28 may be used together with a central gripping area 29 or 29 can be used without jaws 27 and 28. In the embodiment where central gripping area 29 is used, movable wedges 30 of figure 5D travel toward and away from axle pin 31 as shown in figure 5F. These wedges 30 are connected to locking pins 32 and would move inwardly (toward axle pin 31) when in a locking motion or outwardly (away from axle pin 31) when in a releasing or unlocking motion. Wedges 30 move in interstices formed by wedge blocks or guides 33. An item or object to be locked would then be held in gripping area 29 by the wedges 30 which are locked in position. In figure 5F, the components 19, 22 and 24 of figures 5A, 5B and 5C are connected together by an axle pin 31 with four separate locking pins 32 positioned in slots 18, 2l and 25, also shown in figures 5A - 5C. An object to be locked in place can be put between jaws 27 and 28 or can be put in central gripping area 29. When put in central gripping area 29 the tool would function as in a socket system. The wedges 30 use the radial aspect of the locking tilt (earlier discussed in relation to figure 4) to form a socket-like function whereby the four wedges 30 crush into an object placed in gripping area 29. In this mode the locking pins 32 all tilt primarily outward. While in figures 5A and 5B four of each slots 18, 2l and 25 are shown and four wedges 30 are shown, any amount of slots or wedges may be used if desirable. The term "wedges" used throughout the claims and disclosure includes structures where the pins act as the wedge. In figure 5E, a side view of the tool showing jaws or gripping means 27 and 28 are shown in relation to wedge block guides 33 and wedge 30. First handle piece 19 and second handle piece 22 are shown extending outwardly from the gripping area and wedges 30. As noted, while locking tools having one or four slots are illustrated in the drawings, any suitable number of slots, locking pins or wedges may be used if desirable. In figure 6, an embodiment of this invention is illustrated wherein one handle piece 35 has a radially-extending slot 36, and the third piece 37 has an arc-like slot 38. Also, the two handle pieces 35 and 34 have jaws 39 and 40 for holding and locking an item in place. In this embodiment of the invention that there are three pieces movably connected by an axle pin; there are at least two arc-like slots such as slots 38 and 41; these slots 38 and 41 spiral in different directions so that they form an X-like pattern (as shown at 14 in figure 3); at least one piece (here it would be handle 35) has a vertically disposed slot; and all slots are aligned so that the locking pin and axle pin can hold all pieces movably together. The locking pin must be deflectable or distortable so that it will cause a locking action against the faces of the diamond opening as shown in figures 3, 4A and 4B. The embodiment of figure 6 is an alternative to the preferred first embodiment of figure 2. In figure 7 the locking tool 42 of the second embodiment of this invention is illustrated in its assembled condition. The tool 42 comprises in this embodiment three main component pieces, a first handle piece 43, a second handle piece 44 and a third piece 45. The first handle piece 43 has in its upper portion a jaw section 46 and below the jaw section 46 an axle aperture 47 (see figure 8A). By "below" is meant when piece 43 is held vertically, at the top portion would be jaw 46 and "below" would be located aperture 47. Below the axle aperture 47 in first handle piece 43 is a first arc-like slot 48 through which a locking pin 49 will extend and travel. Locking pin 49 will also travel in and extend through a radially-extending slot 50 in second handle piece 44 (figure 8B) and an arc-like slot 51 in third piece 45 (figure 8C). Locking pin 49 (figure 8D) will move as handles when handle pieces 43 and 44 are moved together or pushed apart. When an object is placed between jaw sections 46 and 52 and handles 53 and 54 are squeezed together, locking pin 49 travels or moves in an arc-like fashion through slots 48 and 51 and moves up or down in vertical slot 50. As jaws 46 and 52 are closed upon and grip an object and closing pressure is exerted upon handles 53 and 54 the plate 45 is then rotated against handle 43 against the direction of handle 54. This caused locking pin 49 to be tilted off its original horizontal position and pushes up against or wedges against the walls of the slots 48 and/or 51 overlap with slot 50 to thereby lock the jaws 46 and 52 in position. When similar spiralling slots 48 and 51 overlap and move relative to each other (see figure 9) they form an opening. Locking pin 49 at some point along its length wedges against the walls of this opening 55 when the pin 49 locks in position. An axle pin 56 provides the focal point around which all of the pieces 43, 44 and 45 rotate in use. Axle pin 56 is disposed substantially horizontally through all three pieces 43, 44 and 45 via the apertures 47, 57 and 58 respectively. When locking pin 49 is in its normal condition (unlocked) it will be substantially parallel to the horizontally-disposed axle pin 56. When locking pin 49 is forced against the walls of slots 48 and 51 in a locked position, it will tilt away from its parallel position to axle pin 56. Regardless whether pieces 43 and 44 are rotated via axle pin 56 against the locking pin 49 or the pin 49 is pushed externally against the pieces 43 and 44, when locking occurs the locking pin 49 will tilt. Since there is nothing to hold the pin 49 parallel to the axle pin 56, the pin 49 begins to tilt in the direction of the force on the pin 49 whether the external force on the pin 49 or the blocking force against the pin 49 moving, from the rotation of pieces 43 and 44. Tilt of pin 49 occurs when the pin 49 slides down the closest top or bottom slot 48 or 51 walls. It continues to fall until the opposite end of the pin 49 hits the opposite two adjacent sides of the opening 55 (see figure 9). The opposite end of the pin 49 tends to raise into its nearest slot (toward the original force in a reverse direction). Once pin 49 touches these slot 48 and 51 edges, the pivot or tilt of pin 49 begins. The pin 49 force directed at one corner of opening 55 equals the opposite reaction force at the opposite end of the pin in the opposite direction at the opposite portion of opening 55. In figure 8 the three component pieces 43, 44 and 45 of locking tool 42 are illustrated, piece 43 in figure 8A, piece 44 in figure 8B and piece 45 in figure 8C. The first handle piece 43 has a jaw section 46 at its upper terminal end and a handle section 53 at its opposite terminal end. Below the jaw section 46 is an axle aperture 47 through which axle pin 56 extends when the tool 42 is assembled. Below axle aperture 47 is positioned an arc-like slot 48 through which locking pin 49 will extend when tool 42 is assembled. Slot 48 has a width just slightly (enough for pin 49 to be freely movable therein) greater than the diameter of pin 49. In this second embodiment of the present invention the arc-like slot 48 is disposed on first handle piece 43 in a manner that when assembled and stacked with the other two pieces 44 and 45, it will spiral or arc in the same direction and manner as slot 51 in third piece 45. When moved against or in relation to slot 48 and/or 51, slot 50 will form an opening 55 as shown in figure 9. Jaw section 46 will form the grip when it moves toward complementary jaw section 52 in second handle piece 44. In second handle piece 44 the upper section of piece 44 has an axle aperture 57 which will house axle pin 56 when pin 56 extends through the axle apertures 47, 57 and 58 in pieces 43, 44 and 45 respectively. Below aperture 57 in piece 44 is substantially radially-extending (when assembled as in figure 7) slot 50 that will house, together with slots 48 and 51, locking pin 49. When the term "generally radially-extending" or "radially-extending" is used throughout this disclosure it is meant that the axis of slot 50 is from 0-25° off from a line drawn radially from the center of aperture 57. The slot 50 in figure 8 is drawn at an angle of about 14° off from a pure radial line from the center of aperture 57. Pins 49 and 56 are shown having bevelled edges at their terminal ends, however, any type bolt, screw, rod or the like can be used as long as it is freely movable in slots 48, 50 and 51 (in locking pin) or can suitably act as an axle pin 49. Any stacking order of parts 43, 44 and 45 can be accomplished as long as the intended locking effect is accomplished. In the third piece 45 an arc-like slot 51 is provided which will form an opening 55 when moved relative to slot 48 in the first handle piece 43. Above slot 51 is provided an axle aperture 58 which will receive and house, together with aligned apertures 47 and 57, the pin 56. Piece 45 has a small handle portion 60 that is used to hold piece 45 in alignment with piece 43 by holding the handles 60 and 53 together, an external or additional switch could also be used. In figure 9 a top breakaway view of the pieces 43, 44 and 45 is illustrated. Shown in figure 9 is the opening or pattern 55 formed by arc-like slot 48 and slot 50. It is through this opening 55 that locking pin 49 wedges when jaws 46 and 52 are tightened against an object to be held, and piece 45 is rotated slightly. To release the lock effect, piece 45 is rotated back to a position aligning slots 48 and 51 and locking pin 49 will be released from its locking mode against the walls of opening 55. Figure 10 shows a side schematic view which illustrates (in 10A) the locking pin 49 in an unlocked position which is parallel to axle pin 56. First handle piece 43 is shown stacked against third piece 45 wherein slots 48 and 51 are substantially perfectly aligned. Locking pin 49 is freely movable in slots 48, 51 and 50 until rotation of piece 45 about piece 43 a locking pressure is exerted upon handle sections 53 and 54 whereupon locking pin 49 becomes distorted from parallel and is tilted against the walls of slots 48 and 51 (opening 55) to hold both first and second handle pieces 43 and 44 in a locked position as shown in figure 10B. Axle pin 56 remains substantially in place throughout the locking and unlocking process but locking pin 49 is distorted from parallel when locked. As noted, while locking tools having one or four slots are illustrated in the drawings, any suitable number of slots, locking pins or wedges may be used if desirable. A locking tool having a plurality of arc-like slots and radially extending slots can be used in the present invention. This embodiment would be similar to the tool shown in figures 5A-5F in the first embodiment of this invention described earlier. The arc-like slots of the first-embodiment spiral in opposite directions from each other while the arc-like slots in the second embodiment of the present invention spiral in the same direction. Thus, a tool similar to figures 5A-5F using arc-like slots that spiral in the same direction is incorporated in the present disclosure by reference and is considered included in the second embodiment of the present invention. The preferred embodiments of the present invention have been described herein and shown in the accompanying drawings to illustrate the underlying principles of the invention, but it is to be understood that numerous modifications and ramifications may be made within the scope of the appended claims.

Claims: A locking tool comprising three pieces (2, 3, 4), two of which are handle pieces (2, 3), and two of which (2, 4) co-operate to hold an object, the three pieces being pivotally connected by a pivot pin (15) passing through a pivot hole (6, 16, 17) in each piece, characterised in that two of the pieces (2, 3) each have an arcuate slot (7, 9) spaced from the pivot hole (6, 16) and the third piece (4) has a slot (10) spaced from and extending generally radially of, the pivot hole (17), that a locking pin (8) passes through all three slots, and that on operating the tool so that an object is gripped thereby, the locking pin (8) is tilted to a position which is not parallel with the pivot pin (15), thereby locking the tool. The locking tool of claim 1 wherein one of the handle pieces (2; 19) and the third piece (4; 24) have jaw portions (5, 11; 27, 28) for holding an object. The locking tool of claim 1 wherein the two handle pieces (43, 44; 34, 35) have jaw portions (46, 52; 39, 40) for holding an object. The locking tool of claim 2 or claim 3 wherein the two handle pieces (2, 4; 19, 22) have the arcuate slots (7, 9; 18, 21) and the third piece has the slot which extends radially of the pivot hole. The locking tool of any one of claims 1 to 4 wherein the arcuate slots (7, 9; 18, 21) are curved in opposite senses relative to the pivot hole. The locking tool of claim 2 or claim 3 wherein one of the handle pieces (35; 44) has the slot (36; 50) which extends radially of the pivot hole. The locking tool of claim 6 wherein the arcuate slots (48, 51) are curved in the same sense relative to the pivot hole. The locking tool of claim 7 wherein the third piece has a lever portion (60), whereby the third piece can be moved independently of the handle pieces to tilt the locking pin and thereby lock the tool. The locking tool of any one of claims 1 to 4 wherein each piece (19, 22) has two or more of said slots (18, 21), with a locking pin for each set of co-operating slots. The locking tool of claim 9 including additional gripping members (30) arranged, on operation of the tool, to be driven radially inwards towards the axis of said pivot pin (31) by movement of said locking pins to grip an object to be held adjacent said pivot pin.

Inventors: FORD VERNON J G JR, FORD, VERNON J.G., JR.
Applicants: FORD VERNON J G JR, FORD, VERNON J.G., JR.
Application year: 1991
Main classification: B25B7
IPC codes: B25B7