Camera grip with gear mechanism

Abstract: A camera grip which is removably mounted to the bottom portion of a camera. The camera grip includes an attachment screw member and an operation knob for rotating said screw member. Said screw member and said operation knob are connected with each other by means of a gear mechanism.

Description: The present invention relates to a grip for use with a camera as defined in the precharacterizing portion of claim 1. In general, a camera-integral-VTR (Video Tape Recorder) is designed compact and, therefore, the camera-integral-VTR does not include therein a separate carrying handle which is exclusively used to carry the camera-integral-VTR. Also, although it is possible to mount an under grip to the camera-integral-VTR by use of a tripod screw in the bottom portion of the camera, the thus mounted under grip is projected out from the main body of the camera, which is inconvenient for carrying and also gives rise to a problem in storing the same into a camera case. In view of this, it is desirable that an under grip to be applied to the camera-integral-VTR can be stored compactly and has a function to serve as a carrying handle as well. Also, it is desirable that the under grip, while being mounted to the camera-integral-VTR, can stand stably by itself and can also be used as a simple tripod. Now, in Fig. 8, there is shown a video camera which includes therein a camera grip according to the prior art, and in Figs. 9 to 11, there is shown the above camera grip. As shown in Fig. 8, a video camera 101 includes a lens 102 in the front portion thereof, a view finder 103 and a battery pack 104 in the rear portion thereof, and an insertion portion 105 for insertion of a video tape in the central portion thereof. And, in the lower surface of the video camera 101, there are formed a positioning hole and a screw hole (neither of the them are shown) which are used to fix a grip 111 to be described later. As shown in Figs. 9 to 11, the grip 111 comprises a base part 112 to be fixed to the video camera 101 and a grip main body 113 to be mounted to the base part 112, and the grip 111 further stores therein a leg portion 114 which is used as a tripod. The grip base part 112 is formed in a box shape having an opening in the top portion thereof. To the top opening of the grip base part 112 is fixed a base plate 115 by a plurality of fixing screws 116. A sheet 117 formed of vinyl chloride is fixedly secured to the top surface of the base plate 115 by means of a both-side tape. A mount screw 118 is supported rotatably in the top portion of the grip base part 112. The top end of the mount screw 118 is projected out upwardly, while a disc-like operation knob 119 is formed integrally with the bottom portion of the mount screw 118. Also, a positioning projection 120 is formed integrally with the top surface of the base plate 115. The grip main body 113 is supported rotatably to the grip base part 112 by a support shaft 121 and at the same time can be held at a desired angle by means of an angle lock mechanism. In other words, while a continuously undulated portion 122 is formed integrally with the grip main body 113, in the grip base part 112 there is provided an engagement piece 124 which can be energized by a spring 123 to press against the undulated portion 122. This engagement piece 124 can be operated by a lock lever 126 via a rotary lever 125. Also, in the grip base part 112 there is provided a recording switch button 127 which is used to set the video camera 101 to its recording mode. The recording switch button 127 is supported rotatably by a support shaft 128 to the grip base part 112, and is also energized in a clockwise direction in Fig. 10 by a spring 129. Further, the recording switch button 127 is connected to the video camera 101 by means of a connecting cord or a remotely controlled transmitter. Accordingly, to mount the grip 111 to the video camera 101, the positioning projection 120 of the grip 111 is fitted into the positioning hole in the video camera 101, and the mount screw 118 is inserted into the screw hole in the video camera 101. After then, if the operation knob 119 is rotated, then the grip 111 and video camera 101 are threadedly engaged with each other so that the grip 111 is fixed to the video camera 101. When the video camera 101 is to be operated in the recording mode, an operator may grip the grip 111 and press in the recording switch button 127 with a finger to switch the video camera 101 to the recording mode. If the operator releases the finger, then the recording mode of the video camera 101 can be cancelled and thus the recording can be stopped. However, the above-mentioned grip 111 cannot be stored compactly or thinly in the camera bottom portion and it cannot be used as a carrying handle. Also, conventionally, there have been proposed and put into practical use various kinds of other grips such as a grip which can be stored compactly or thinly, a grip usable as a simple tripod, a grip usable as a simple tripod and a carrying handle and the like (see Japanese Utility Model Publication No. 59-2398, Japanese Utility Model Publication No. 50-16490, and Japanese Patent Application Laid-open (Tokkai) No. 56-127895). However, conventionally, there has never been known such grip of this type which can be stored compactly in the bottom portion of a camera when not in use, is stable when it stands by itself, can be used as a carrying handle, and can be handled properly. On the other hand, the position for fixing the grip 111 with respect to the video camera 101 is decided in consideration of the holding stability of the grip 111. That is, the screw hole of the video camera 101 is formed so as to be situated at the center of gravity of the video camera 101. However, in some of the video cameras 101 of this kind, the position of the screw hole may be altered according to the design requirements, the internal mechanisms and the like. In this case, the above-mentioned conventional grip 111 cannot be fixed at a predetermined position in such video camera 101, which provides a problem to be solved. In other words, if the grip 111 cannot be fixed at the predetermined position in the video camera 101, then the operator finds it troublesome to hold the video camera 101 and thus the operationability of the video camera 101 is worsened. In order to avoid the above problem, conventionally, there has been developed an idea that the mount screw 118 (and the operationable knob 119) is adapted to be movable back and forth or right and left. However, due to the fact that the grip 111 includes therein the leg portion 114 to be used as a tripod, a battery charger, a remotely controlled transmitter and the like, it is very difficult to provide such movable mount screw 118 in the grip 111. Even if such movable mount screw 118 can be provided, the grip 111 must be increased in size, which provides another problem. Also, new grips can be applied to the respective video cameras having different mount hole forming positions, but this inevitably increases the manufacturing costs of the grips and the grips are expensive accordingly. SUMMARY OF THE INVENTION The present invention aims at eliminating the drawbacks found in the above-mentioned prior art camera grips. Accordingly, it is an object of the invention to provide a camera grip which can be mounted easily even when the position of a hole in a camera for mounting the grip to the camera is altered. In order to achieve the above object, according to the invention, there is provided a camera grip as defined in claim 1. According to a preferred embodiment of the present invention, there is provided a camera grip on the top surface-of which a camera is fixedly placed, in which there is provided a mount screw projecting out from the top portion of the grip and threadedly engageable with the lower portion of the camera, there is provided an operation knob used to rotate the mount screw, and the mount screw and operation knob are connected with each other by means of a gear mechanism. According to the invention, due to the fact that the operation knob is connected through the gear mechanism to the mount screw for fixing the grip, even if the position of a screw hole in the camera is altered, the mount screw can be set according to the altered screw hole positions and thus the grip can be mounted easily at a predetermined position in the camera. BRIEF DESCRIPTION OF THE DRAWINGS The exact nature of this invention, as well as other objets and advantages thereof, will be readily apparent from consideration of the following specification relating to the accompanying drawings, in which like reference characters designate the same or similar parts throughout the figures thereof and wherein: Fig. 1 is a partially cut-away front view of a preferred embodiment of a camera grip according to the invention; Fig. 2 is a perspective view of the above preferred embodiment; Fig. 3 is an exploded perspective view of a grip base part of a camera grip according to a preferred embodiment of the invention; Fig. 4 is a section view taken along the line XIII - XIII in Fig. 1, illustrating a gear mechanism; Fig. 5 is a section view of another gear mechanism; Fig. 6 is a partially cut-away front view of a second preferred embodiment of a camera grip according to the invention; Fig. 7 is a front view of a modification of another preferred embodiment of the camera grip shown in Fig. 6; Fig. 8 is a front view of a video camera incorporationg terein a camera grip according to the prior art; Fig. 9 is a perspective view of the above prior art camera grip; Fig. 10 is an exploded perspective view of a grip base part of the prior art camera grip; and, Fig. 11 is a longitudinal section view of the prior art camera grip. DETAILED DESCRIPTION OF THE INVENTION Detailed description will hereunder be given of the preferred embodiments of a camera grip according to the present invention with reference to the accompanying drawings. Referring now to Figs. 1 to 4, there is shown a preferred embodiment of a camera grip according to the invention. In these figures, parts having the same functions as the conventional parts shown in Figs. 8 to 11 are given the same designations and the description thereof is omitted here. As shown in Figs. 1 to 4, a grip 131 comprises a grip base part 132 to be fixed to a video camera and a grip main body 113. A mount screw 136, which is used to fix the grip 131, is connected to an operation knob 133 through a gear mechanism. The grip base part 132 supports a disc-like operation knob 133 in the upper portion thereof in such a manner that the operation knob 133 can be rotated freely. The operation knob 133 includes an internal gear 134 in the inner periphery thereof. And, an external gear 135 is disposed inside the operation knob 133 and meshes with the internal gear 134. The external gear 135 includes in the upper portion thereof a mount screw 136 formed integrally therewith, and the leading end portion of the mount screw 136 extends through a base plate 137 fixed to the upper portion of the grip base part 132 and projects out upwardly. The position of the mount screw 136 is set so as to match a screw hole (not shown) formed in a video camera. When the position of the screw hole is altered, the external gear 135 having the mount screw 136 may be moved within a range in which the external gear 135 meshes with the internal gear 134 to match the altered screw hole, that is, the base plate 137 need only to be replaced. The base plate 137 includes in the upper surface thereof a positioning projection 138 formed integrally therewith. Now, to mount the grip 131 to the video camera, the positioning projection 138 of the grip 131 may be fitted into a positioning hole formed in the video camera and the mount screw 136 may be inserted into the above-mentioned screw hole in the video camera, and after then the operation knob 133 may be rotated to thereby bring the grip 131 and video camera into threaded engagement with each other, so that the grip 131 can be fixed to the video camera. During this operation, if the operation knob 133 is rotated, then the internal gear 134 is rotated integrally with the knob 133 and thus the external gear 135 meshing with the internal gear 134 is caused to rotate at that position, which in turn causes the mount screw 136 to rotate and thus to engage threadedly with the screw hole in the video camera. As described above, according to the illustrated embodiment of the invention, even if the screw hole of the video camera is not positioned at the center of gravity of the video camera, because the mount screw 136 is disposed so as to correspond to the position of the screw hole by means of the external gear 135, the grip 131 can be easily mounted to a predetermined position of the video camera. In the above-mentioned embodiment, the internal gear 134 is formed in the operation knob 133 and the mount screw 136 is formed in the external gear 135 which meshes with the internal gear 134. However, as shown in Fig. 5, an external gear 142 is formed integrally with an operation knob 141 at the central position thereof, an internal gear 144 may be formed so as to be able to mesh with the external gear 142, and a mount screw 145 may be formed in the internal gear 144. In this case, to mount the grip 131 to the video camera, the mount screw 145 is inserted into a screw hole formed in the video camera, the operation knob 141 is rotated to thereby rotate the external gear 142 integrally therewith. As a result of this, the internal gear 144 meshing with the external gear 142 is rotated at that position to thereby rotate the mount screw 145, so that the mount screw 145 can be threadedly engaged with the screw hole in the video camera. That is, the grip 131 can be fixed to the video camera. Referring now to Fig. 6, there is shown a second embodiment of a camera grip according to the invention. Here again, parts having the same functions as those illustrated in the previous embodiments of the invention are given the same designations and the description thereof is omitted here. As shown in Fig. 6, in the present embodiment, a grip 151 includes a grip base part 152 and, in the upper portion of the grip base part 152, a disc-like operation knob 153 is rotatably supported. The operation knob 153 includes an external gear 154 formed integrally therewith. The external gear 154 is arranged to mesh with an idle gear 155, which in turn meshes with an external gear 156. The external gear 156 includes on the top portion thereof a mount screw 157 formed integrally therewith. The mount screw 157 has a leading end portion which extends through a base plate 158 fixed on the top portion of the grip base part 152 and projects out upwardly from the base plate 158. In the present embodiment, to mount the grip 151 to a video camera, the mount screw 157 is inserted into a screw hole formed in the video camera and the operation knob 153 is then rotated to thereby rotate the external gear 154 integrally with the operation knob 153. The rotation of the external gear 154 causes the mount screw 157 to rotate by means of the idle gear 155, so that the mount screw 157 can be threadedly engaged with the screw hole in the video camera. In this manner, the grip 151 can be fixed to the video camera. Referring now to Fig. 7, there is shown a front view of a modification of another embodiment of the camera grip shown in Fig. 6. In this figure, parts having the same functions as those employed in the grip shown in Fig. 6 are given the same designations and the description thereof is omitted here. In Fig. 7, the rotational force of the operation knob 153 is transmitted to the mount screw by means of an idle gear, similarly in the grip shown in Fig. 6. A grip main body 160 shown in Fig. 7 is different from that shown in Fig. 6, in that it includes in the center portion thereof an opening 160A in which operator's middle, medical and little fingers can be inserted and also includes in upper portion thereof a recess 160B on which operator's forefinger can be put hookingly. In other words, the grip main body 160 can be used as a carrying handle. When it is used as a carrying handle, a lock removing button 162 can be used to determine the angle of the grip main body 160 so that the grip main body 160 is parallel to the camera main body. Then, by inserting the middle, medical and little fingers into the opening 160A in the grip main body 160 and also by hookingly putting the forefinger on the recess 160B, the operator can hang and carry the camera. In Fig. 7, reference numeral 164 designates a connecting cord which is to be connected to a remote-control termainal provided in the camera main body. Also, in the bottom portion 160C of the grip main body 160, there are incorporated a remote-control light receiving part and a display lamp. Due to this, especially when the grip is used as a tripod, the camera main body can be remotely controlled by means of the thus constructed grip. It should be noted here that the gear mechanism is not limited to that employed in the present embodiment, but other gear mechanisms can also be used. Also, in the respective embodiments of the invention, by changing the gear ratio, the present camera grip can be easily fixed to the camera with a small force and can be operated even by a woman operator. As has been described in detail heretofore by way of the preferred embodiments, according to the camera grip of the invention, due to the fact that there is provided a mount screw which projects out upwardly and threadedly engages with the lower portion of a camera, there is provided an operation knob which is used to rotate the mount screw, and the mount screw and operation knob are connected with each other by means of a gear mechanism, even if the position of a screw hole to be formed in the camera is altered, the mount screw can be set easily at such a position to correspond to the altered position of the screw hole so that the grip can be mounted for sure to a predetermined position in the camera. Also, the present grip can be obtained simply by changing only the upper portion of a conventionally used grip and thus the costs of the grip need not be increased, that is, the present grip can be supplied at low costs. It should be understood, however, that there is no intention to limit the invention to the specific forms disclosed, but on the contrary, the invention is to cover all modifications, alternate constructions and equivalents falling within the scope of the invention as expressed in the appended claims.

Claims: A camera grip which is removably attachable to a bottom portion of a camera, comprising a mount screw (136, 145, 157) projecting out upwardly and threadedly engageable with said camera bottom portion, and an operation knob (133, 141, 153) for rotating said mount screw (136, 145, 157), characterised in that said mount screw (136, 145, 157) and said operation knob (133, 141, 153) being connected with each other by means of a gear mechanism (134, 135, 142, 144, 154, 155, 156). A camera grip as set forth in claim 1, wherein said gear mechanism (134, 135, 142, 144, 154, 155, 156) comprises a first gear (135, 144) fixed coaxially with the shaft of rotation of said mount screw (136, 145) and a second gear (134, 142) fixed coaxially with the shaft of rotation of said operation knob (133, 141) and meshable with said first gear (135, 144). A camera grip as set forth in claim 1 or 2, whrein said first gear (135, 144) is an external gear (135) and said second gear (134, 142) is an internal gear (142). A camera grip as set forth in at least one of claims 1 to 3, wherein said first gear (135, 144) is an internal gear (144) and said second gear (134, 142) is an external gear (142). A camera grip as set forth in at least one of claims 1 to 4, wherein said gear mechanism (134, 135, 142, 144, 154, 155, 156) comprises a first external gear (156) fixed coaxially with the shaft of rotation of said mount screw (157), a second external gear (154) fixed coaxially with the shaft of rotation of said operation knob (153), and an idle gear (155) meshable with said first and second external gears (156, 154) respectively.

Inventors: HAYASHIDA TAKAYUKI, SASAKI HIDEMI, HAYASHIDA, TAKAYUKI, SASAKI, HIDEMI
Applicants: FUJI PHOTO FILM CO LTD, FUJI PHOTO FILM CO., LTD.
Application year: 1991
Main classification: G03B17
IPC codes: F16M11, G03B17, H04N5