A HAND TOOL FOR CONNECTING WIRES TO ELECTRICAL TERMINALS OF AN ELECTRICAL CONNECTOR

Abstract: A hand tool for connecting wires to electrical ter­ minals of an electrical connector (78) comprises a wire insertion head (18) defining a guideway (30) for the connector (78) and a ram (64) for driving wires succes­ sively into terminals of the connector (78), which are arranged in a row therealong. For advancing the connector by a step along the guideway after each wire has been inserted into a ter­ minal, the ram (64) has a depending pin (76) engaging in a transverse slot (42) in a cam plate (40) carrying a spring loaded connector advancing pawl (46) for en­ gaging teeth (77) on the connector (78).

Description: A hand tool for connecting wires to electrical terminals of an electrical connector. There is disclosed in EP-Al-O,032,6l6, a hand tool for successively connecting wires to respective electrical terminals arranged in a row extending along a housing of an electrical connector, the tool comprising a wire insertion head, defining a connector guideway, a wire insertion ram, means for driving the ram towards and away from the guideway transversely of the length thereof, and means connected to the ram for advancing the connector step by step along the guideway to bring each terminal in turn into alignment with the ram to allow the ram to connect a wire to the terminal. In this own tool, the connector advancing means comprises a wheel, the periphery of which engages the connector and which is driven by the ram through a link extending beneath the guideway. The invention is intended to provide a hand tool, in which the actuation of the connector advancing means can. be more positively felt by the operator than is the case jh the knowl tool, which is of more colepact construction than the known tool, and which can readily be provided with means for adjusting the connector advancing means to comply with the spacing between the terminals of the row. According to the invention, a hand tool as defined in the first aah of this specification is characterised in that the connector advancing means comprises a cam plate formed with a cam slot extending transversely of the path of movement of the ram and receiving a camming pin which is fixed with respect to the ram, the cam plate carrying a connector advancing pawl arranged to be spring biased into engagement with the connector, the cam plate being derivable by the ram transversely of the path of movement thereof. The pawl can be arranged to engage teeth on the connector with a snap action during the operation of the connector advancing means, so that the operator is imnediately aware-tnat the tool is ready for further operation after a wire has been connected to a terminal of the connector. The connector advancing means can be substantially completely enclosed in a channel formed in the insertion head and covered by a cover plate Advantageously, the ram is received in a yoke member connected to a ram drive shaft, the camming pin extending from the yoke member, a connecting pin being insertable into first bores or alternatively into second bores, in the yoke member and ram, to connect the ram to the yoke member, the first bores being spaced from the second bores lengthwise of the path of movement of the ram, the connector advancing advancing means being thereby adjustable to comply with the spring between the terminals of the row. For a better understanding of the invention reference will now be made by way of example to the accompanying drawings, in which: Figure 1 is a perspective view of a hand tool, according to a first embodiment of the invention, for use in successively connecting wires to respective electrical terminals arranged in a row extending along a housing of an electrical connector; Figure 2 is a fragmentary section taken on the lines II - II of Figure 1 showing part of the tool in a first position; Figure 3 is a view similar to that of Figure 2 but showing the parts in a second and subsequent position; Figure 4 is a fragmentary section taken on the lines IV - IV of Figure 1 showing the tool when adjusted for use where the terminals of the row have a first centre-to-centre spacing; ; Figure 5 is a view similar to that of Figure 4 but showing the tool when adjusted for use where the terminals have a second centre-to-centre spacing; Figure 6 is an exploded perspective view of an adjustment mechanism of the tool; Figure 7 is a fragmentary sectional view illustrating a modification of the tool by means of. an insert; Figure 8 is a fragmentary sectional view of a hand tool according to a second embodiment of the invention, for use in successively connecting wires to respective electrical terminals arranged in a row along a housing of an electrical connector; and Figure 9 is a plan view of the tool of Figure 8 with parts omitted. As shown in Figure 1, the tool 10 according to the first embodiment comprises hand grip 12 having an actuating level 14, a full stroke ratchet mechansim constructed according to the teaching of US-A-3,039,337, spanning the free ends of the hand grip 12 and the lever 14. As its forward end, the tool 10 has an insertion head 18 having a tubular portion 20 (Figures 4 and 5) received in an axial bore 22 of a tool barrel 23 on the hand grip 12. The portion 20 has an axial bore 24 receiving an actuation rod 26 The rod 26 is biased by a compression spring 28 and is driven by the lever 14 according to the teaching of US-A-3,742,571. The head 18 has a transverse groove 30, as best seen in Figures 4 and 5, to receive an electrical connector 78 of the kind disclosed in US-A-4,243,288. The insulating housing of the connector 78 has on each side thereof a row of pockets 79 (Figure 1) each containing a wire-receiving portion of an electrical terminal (not shown), each wire receiving portion having a wire-receiviny slot. The housing of the connector 78 also has on each side thereof a row of indexing slots 77 each of which is aligned with one of the pockets 79, the slots 77 being defined by barriers 77' (Figures 2 and 3) formed on the connector housing. Opening into one wall of the groove 30 is a spring loaded ratchet stop comprising a pawl 32, a loading spring 34, and a screw threaded plug 36. In the opposite wall of the groove 30 is a horizontal slot 38 receiving a cam plate 40 having an oblique slot 42 therein. The forward part of the plate 40 has a recess 44 containing a driving pawl 46 having a connector engaging tooth 48 and being loaded by a compression spring 50, the pawl 46 being parallel with the plate 40. The rod 26 has at its forward end, a yoke member 52 (Figures 4 to 6) with an axial threaded bore 54 receiving a screw threaded end portion of the rod 26. The yoke member 52 has a longitudinally extending channel 56 (Figure 6) with which communicate a first pair of horizontal lateral bores 58 and a second pair of horizontal lateral bores 60 (one shown), and a vertical bore 62 in the base of the channel 56. A wire insertion ram 64 received in the slot 56, is joined to the yoke member 52 by means of a removable pin 66 which can be passed through either of the bores 58 or 60 and through the appropriate bore 68 or 70 in the ram 64. The bottom of the ram 64 is formed with a recess 72, the leading end 74 of the ram 64 being shaped for engaging a wire to drive it into the wire receiving slot of a terminal of the connector 78. The yoke member 52 also has a pin 76 which depends through the bore 62 into the slot 42 of the plate 40. A ram and wire guide plate 81 secured to the head 18 is provided with a vertical wire slot 82 at its forward end. In operation, a connector 78 is inserted into the slot 30, as shown in Figure l, so that the tooth 48 of the pawl 46 engages in a desired one of the slots 77 in the housing of the connector 78, and a wire 80 is inserted into the slot 82. The actuating lever 14 is squeezed against the hand grip 12 driving the actuation rod 26 forward against the restraining action of the spring 28, whereby, the yoke member 52 moves forwardly so that the leading end 74 of the insertion ram 64 engages the wire 80 and drives it into the wire-receiving slot of the terminal of the connector 78, which slot has been aligned with the ram 64, by virtue of the engagement of the pawl 46 in the slot 77. At the same time the forward movement of the yoke member 52 causes a lateral movement of the plate 40 (downward as seen in Figures 2 and 3) by virtue of the engagement of the pin 76 in bore 62 and in the oblique slot 42. At the end of the forward motion of the yoke member 52, the tooth 48 of the pawl 46 slides over the next adjacent barrier 77 on the connector housing (as shown in Figure 3) and engages in the next successive slot 77 with a snap action to index the connector through the tool (upwards as seen in figures 2 and 3) by one step. The pawl 32 secures the connector 78 against return movement. Repeated actuation of the lever 14 causes the connector to be indexed step-by-step through the tool so that wires inserted sequentially into the slot 82 can each be connected to one of the terminals on that side of the connector which faces the ram 54. Since the connector 78 has two opposite rows of terminals it must be passed through the tool twice in order to connect wires to the terminals of each row. The tool can also be adapted for use with a narrower connector (not shown) having only a single row of terminals, by placing an insert 84, Figure 7, in the groove 30 to reduce the width thereof sufficiently to cause the narrower connector to fit snugly in the groove 30. In this case the pawl 32 is replaced by a pawl 32' of a greater length than the pawl 32 and which extends through an opening 85 in the insert 84. In order to adjust the tool to accommodate an electrical connector having a different centre-to-centre spacing between the terminals of the or each row, it is only necessary to remove the pin 66 and realign it with the appropriate bore 58 or 60 in the yoke member 52 and the appropriate bore 68 or 70 in the insertion member 64. According to Figure 4, the pin 66 is positioned in the bores 58 and 68, and according to Figure 5, the pin 66 is positioned in the bores 60 and 70 whereby the travel of ram 64 and thus of the pin 36 is increased by a length L. The second embodiment of the invention will now be described with reference to'Figures 8 and 9. The hand tool of the second embodiment includes an insertion head 112 fixed at one end to a tubular tool barrel 113 receiving a wire insertion ram 114. The head 112 comprises a.removable connector guide member 115. A channel 118 formed in the head 112 receivt-s a connector indexing mechanism 119 comprising a slidable cam plate 121 mounted on roller bearings 122 located in a track 123 constituted by a recess in the base of the channel 118, and the rotational axes of which extend at right angles to the path of movement of the ram 114. A mounting plate 124 fixed to one end of the cam plate 121 carries a spring biased connector indexing pawl 125. A transversely inclined cam slot 126 is provided adjacent to the other end of the cam plate 121. A cover plate 127 extending across the channel 118 defines in co-operation with the guide member 115, a guideway 116 for an electrical connector (not shown) of similar type to the connector 78 but having a row of teeth along its base. The cover plate 127 is formed with a slot 128 extending lengthwise of the guideway 116 at a position remote from the ram 114, through which slot 128 the pawl 125 protrudes. A further slot 129 in the plate 127 extends transversely of the slot 128 near that end of the plate 127 which is remote from the slot 128. A calming pin 131 screw threaded into the ram 114, projects through the slot 129 into-t.he slot 126. The rotational axes of the bearings 122 also extend at right angles to the length of the guideway 116. The ram 114 and barrel 113 are respectively connected to an actuating lever (not shown) and to a hand grip (not shown), which may be similar to those described above with reference to the first embodimenL-. In operation, with a connector (not shown) .received in the guidy 316, forward movement of the ram 114 upon the actuating lever being squeezed, causes the pin 131 to move along the cam slot 126 so that the cam plate 121 is moved transversely of the direction of advance of the ram 114, as indicated by the arrow in Figure 9, the pawl 125 being depressed by a tooth on the base of the connector against the action of the spring of the pawl 125 and subsequently rising with a snap action. As the ram 114 returns, the movement of the cam plate 121 is reversed so that the pawl 125 engages the tooth, to advance the connector by one step along the guideway 116 to bring the next successive terminal into alignment with the ram 114. The plates 121 and 127 and their associated parts can readily be assembled to the insertion head prior to the assembly of the connector guide member 115, the ram 114 and the pin 131.

Claims: Claims: 1. A hand tool. for successively connecting wires to respective electrical terminals arranged in a row extending along a housing of an electrical connector, the tool comprising a wire insertion head (18 or 112), defining a connector guideway (30 or 116), a wire insertion ram (64 or 114), means (14, 28) for driving the ram (64 or 1.14) towards and away from the guideway (30 or 116) transversely of the length thereof, and means (46 or 125) connected to the ram (60 or 114) for advancing the connector step by step along the guideway (30 or 116) to bring each terminal in turn into alignment with the ram (64 or 114) to allow the ram (64 or 114) to connect a wire to the terminal, characterised in that the connector advancing means comprises a cam plate (40 or 121) formed with a cam slot (42 or 126) extending transversely of the path of movement of the ram (64 or 114) and receiving a calming pin (76 or 131) which is fixed with respect to the ram (64 or 114), the cam plate (40 or 121) carrying a connector advancing pawl (46 or 125) arranged to be spring biased into engagement with the connector, the cam plate (40 or 121) being drivable by the ram (64 or 114) transversely of the path of movement thereof. 2. A tool according to Claim 1, characterised in that the cam plate (40 or 121) is slidably mounted in a recess in the insertion head (18 or.112), the cam slot (42 or 126) being remote from the pawl (4 & or 125) and the pin (76 or 131) projecting into the recess through an opening in the insertion head (18 or 112). 3. A tool according to Claim 1 or 2, characterised in that the ram (64) is received in a yoke member (52) connected to a ram drive shaft (26), the camming pin (76 or 1.31) extending from the yoke member (52), a connecting pin (66) being insertable into first bores (58 and 68) or alternatively into second bores (60 and 70), in the yoke member (52) and ram (64), to connect the ram (64) to the yoke member (52), the first bores (58 and 68) being spaced from the second bores (60.and 70) lengthwise of the path of movement of the ram (64) 4. A tool according to Claim 3, characterised in that the ram (64) is received in an axial channel (56; in the yoke member (52), the camming pin (76) being slidably received in an opening (62) in the bore of the channel (56), the first and second bores (58 and 68) and (60 and 70) comprising bores (58 and 60) formed in the walls of the channel (56) and through bores (68 and 70) in the ram (64). 5. A tool according to any one of the preceding claims, characterised in that the pawl (46) is mounted in a recess (44) in the cam plate (40) and is parallel therewith, a biasing spring (50) for the pawl (453 also being mounted in the recess (44). 6. A tool according to any one of the preceding claims, characterised in that a spring loaded ratchet stop (32) projects from a side wall of the guideway (30), which is remote from the ram (64), in substantial alignment with the pawl (46). 7. A tool according to Claim 6, characterised by aninsert (84) positioned in the guideway (30) against that said remote side wall thereof to reduce the width of the guideway (30), the ratchet stop (32) protruding through an opening (85) in the insert (84). 8 A too3. secordi.ng to Claim 1 or 2 characterised in that the pawl (125) projects perpendicularly from the cam plate (121) through an opening (128) in a cover plate (127) provided between the cam plate (121) and the ram (114). 9. A tool according to Claim 8, characterised in that the guideway (116) is defined by the cover plate (127) and by a guideway member (125), detachably connected to the insertion head (112). 10. A tool according to Claim 1, 2, 8 or 9, characterised in that the cam plate (121) is mounted upon roller bearings (122) having axes of rotation which extend at right angles to the length of the guideway (116) and to the path of movement of the ram (114)

Inventors: CASEY, DANIEL THOMAS, FORSTER, PETER, MAACK, WERNER, Förster, Peter
Applicants: AMP INCORPORATED
Application year: 1982
Main classification: H01R43
IPC codes: H01R43