Claims
- 1. An automatic assembly machine comprising a support having a first section and having a second section adapted to shift horizontally relative to said first section, an automatic fastener driver, means mounting said fastener driver on said second section of said support for up and down movement between a raised retracted position and a lowered driving position, said mounting means anchoring said fastener driver against rotation relative to said second section of said support, a power-operated actuator connected between said fastener driver and said second section of said support and selectively operable to move said driver upwardly and downwardly between said positions, and manually operable means for use in shifting said fastener driver and said second section of said support horizontally relative to said first section of said support and for controlling said actuator means thereby to control up and down movement of said fastener driver, said manually operable means comprising a downwardly extending handle movable with said second section of said support, said handle defining a grip which may be manually grabbed and manually pushed or pulled horizontally to effect horizontal shifting of said fastener driver and said second section of said support relative to said first section of said support, means mounting said handle for up and down movement relative to said fastener driver between a raised normal position and a lowered actuated position, means urging said handle upwardly to said normal position, and means responsive to downward movement of said handle to said actuated position to cause said actuator to move said fastener driver downwardly to said driving position and responsive to upward movement of said handle to said normal position to cause said actuator to move said driver upwardly to said retracted position.
- 2. An automatic assembly machine as defined in claim 1 in which said handle comprises a generally cylindrical central core and further comprises a plastic grip fitted onto said core, one side of said grip being formed with multiple scallops for accommodating the fingers of the operator of the machine.
- 3. An automatic assembly machine as defined in claim 1 in which said power-operated actuator comprises a reciprocating pneumatic actuator, said responsive means comprising a pilot valve communicating with a supply of pressurized air, said machine further comprising a relay valve controlled by said pilot valve and operable to control said actuator.
- 4. An automatic assembly machine as defined in claim 1 in which said handle includes a central and generally vertically extending axis, said handle being rotatable about said axis and relative to said second section of said support.
- 5. An automatic assembly machine as defined in claim 1 further including means supporting said handle on said support for pivoting about a vertical axis between a left-hand position and a right-hand position, and means for retaining said handle in either said left-hand position or said right-hand position and selectively releasable to permit said handle to pivot about said axis between said left-hand position and said right-hand position.
- 6. An automatic assembly machine as defined in claim 5 in which said supporting means comprise a first bracket attached to said second section of said support, a second bracket carrying said handle and pivotally attached to said first bracket, said retaining means being carried by said second bracket and being releasably engageable with said first bracket.
- 7. An automatic assembly machine as defined in claim 6 in which said second section of said support includes left and right sides, and means for attaching said first bracket to either the left side or the right side of said second section.
- 8. An automatic assembly machine as defined in claim 1 in which said handle is connected to said fastener driver and moves upwardly and downwardly with said fastener driver relative to said second section of said support.
- 9. An automatic assembly machine as defined in claim 1 in which said handle is connected to said second section of said support and remains at a fixed elevation except when shifted between said normal and actuated positions, said fastener driver moving upwardly and downwardly between said retracted position and said driving position without effecting vertical movement of said handle.
- 10. An automatic assembly machine comprising a support having a first section and having a second section adapted to pivot about an upright axis relative to said first section, an automatic fastener driver, means mounting said fastener driver on said second section of said support for up and down movement between a raised inactive position and a lowered driving position, a reciprocating pneumatic actuator connected between said fastener driver and said second section of said support, said actuator having upper and lower chambers and being operable to lower said fastener driver to said driving position when pressurized air is admitted into one of said chambers and to raise said fastener driver to said inactive position when pressurized air is exhausted from said one chamber, a control valve having a valve member shiftable to a first position to admit pressurized air into said one chamber and to a second position to exhaust pressurized air from said one chamber, said valve member shifting from one of its positions to the other of its positions in response to the pressurization of pilot air at said control valve and shifting reversely between its positions in response to depressurization of the pilot air, and manually operable means for use in pivoting said fastener driver and said second section of said support relative to said first section of said support and for controlling shifting of said valve member thereby to control up and down movement of said fastener driver, said manually operable means comprising a downwardly extending handle movable with said second section of said support, said handle defining a grip which may be manually grabbed and manually pushed or pulled horizontally to effect pivoting of said fastener driver and said second section of said support relative to said first section of said support, means mounting said handle for up and down movement relative to said fastener driver between a raised normal position and a lowered actuated position, means urging said handle upwardly to said normal position, a pilot valve having a valve element movable upwardly and downwardly with said handle, a supply of pressurized air communicating with said pilot valve, said valve element being operable to cause pressurized pilot air to be supplied at said control valve in response to movement of said handle in one direction between said normal and actuated positions and being operable to cause depressurization of the pilot air at said control valve in response to movement of said handle in the opposite direction between said normal and actuated positions.
- 11. An automatic assembly machine as defined in claim 10 in which said valve element of said pilot valve causes pressurized pilot air to be supplied at said control valve when said handle is pulled downwardly, said valve member of said control valve shifting to said first position in response to the pressurization of pilot air at said control valve.
CROSS-REFERENCE TO A RELATED APPLICATION
This application is a continuation-in-part of my copending application Ser. No. 560,854, filed Jul. 27, 1990, now abandoned.
This invention relates to an automatic assembly machine and, more particularly, to an assembly machine of the type having an automatic fastener driver for assembling screws, nuts and the like with workpieces.
Automatic assembly machines of the same general type as the machine of the present invention are disclosed in Dixon U.S. Pat. No. 3,279,045; Dixon U.S. Pat. No. 3,675,302; and Dixon U.S. Pat. No. 3,910,325. The fastener drivers of such machines include a rotary motor operable to drive a screwdriver bit, a socket wrench or other tool; the fasteners being fed one-by-one to the tool. The machines are used by moving the fastener driver horizontally to an appropriate position over a workpiece and then by moving the driver downwardly to effect assembly of the fastener with the workpiece. The fastener driver then is retracted upwardly and is repositioned horizontally to a different position over the workpiece preparatory to driving the next fastener.
The fastener driver disclosed in Dixon U.S. Pat. No. 3,910,325 is basically a hand-held unit and has extreme flexibility of positioning. Because the driver is hand-held, however, the operator's wrist is subjected to a flexing force as the fastener is torqued down by the power-rotated tool. After the operator uses the fastener driver over a prolonged period of time, the repeated flexure of the wrist may lead to carpal tunnel syndrome.
In the fastener drivers of Dixon U.S. Pat. Nos. 3,279,045 and 3,675,302, the operator grips a handle-like member to steer the tool to different locations and pushes and releases a thumb button in order to control a power-operated actuator for effecting up and down movement of the tool. The thumb button is positioned above the handle-like member and becomes tiring and uncomfortable to operate over the course of a work shift.
The general aim of the present invention is to provide a new and improved automatic assembly machine of the foregoing type having a unique handle which is used both to steer and to effect up and down movement of the fastener driver and which provides greater operator comfort and ease of operation than has been possible heretofore.
A more detailed object of the invention is to achieve the foregoing by providing an automatic assembly machine which is equipped with a depending handle which may be gripped comfortably by the operator in order to steer the fastener driver and which may be bodily moved upwardly and downwardly in order to control the power-operated actuator for effecting up and down movement of the driver.
A further object of the invention is to provide a handle which is capable of turning with the hand of the operator and relative to the fastener driver and which is capable of being quickly changed over between right-hand operation and left-hand operation.
Still another object is to provide a handle which remains at a substantially fixed elevation as the fastener driver moves upwardly and downwardly.
The invention also resides in the unique incorporation of a pilot valve into a steering handle, the pilot valve being responsive to up and down movement of the handle to control the up-down actuator of the fastener driver.
These and other objects and advantages of the invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.
US Referenced Citations (5)
Continuation in Parts (1)
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560854 |
Jul 1990 |
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Patent Grant
5109736
