Patent Application
20070175011
This invention relates generally to the automotive vehicle manufacturing industry, and more particularly to assembly of automotive chassis components to automotive bodies.
In the automotive vehicle manufacturing industry, it is customary to install various parts onto a vehicle frame to produce a vehicle chassis, and then “marry” the vehicle chassis to a vehicle body. The vehicle frame is first inverted or turned “upside down” so that certain suspension components such as front and rear upper and lower control arms, and knuckles with hubs, can be installed on the frame. Next the frame is turned “right side up” so that further parts such as the power train, brake lines, wiring harnesses, and wheels can be installed on the frame, thereby forming the chassis (sometimes also referred to as “chassis frame”). For techniques of marrying an automotive chassis to an automotive body, see U.S. patent application Ser. Nos. 11/112,599 and 60/632,117, hereby incorporated by reference herein.
“Spindle extensions” are used to secure automotive chassis components to automotive bodies. Typically there are up to 30 spindle extensions on a “suspension build up pallet.” An operator (or automatic equipment) loads an automotive chassis component, for example a heat shield or even an entire rear suspension module, onto the pallet. The upper ends of the spindle extensions hold the bolts or nuts to secure the chassis component to the body. The lower ends of the spindle extensions have sockets which are engaged by “nut runners,” or nut drivers. The nut runners torque the spindle extensions which in turn torque the bolts into place thus securing the chassis component, carried by the pallet, to the body.
The spindle extensions must be able to be moved in x axis and y axis directions (i.e. in a plane parallel to the plane of the pallet and hence automotive body) and well as radially. The x and y motion (and z axis, or vertical, motion) is handled via the pallet. See the above-referenced patent applications. The radial motion is provided by the spindle extension. More particularly, the spindle extension, while holding the bolt or nut in place, must provide some “positional compliance” or “locational tolerance.” Such positional compliance or locational tolerance is required to compensate for manufacturing tolerances inherent in the various chassis components and in the body itself, and to allow the threads of the bolt to align themselves with the threads of the nut to prevent cross-threading during running of the bolt by the nut runner.
Currently spindle extensions include an expensive spherical bearing which provides movement in the radial direction and thus positional compliance and/or locational tolerance. To prevent excess radial motion, the current spindle extension must be loosely held by some type of device, for example a bracket having a hole which is slightly larger in diameter than the diameter of the spindle extension. Since the spindle extension is located in the hole in the bracket, the hole necessarily limits the radial travel of the spindle extension.
It is desirable to eliminate the expensive spherical bearing and the bracket in the spindle extensions, while still providing for radial movement.
The present invention is apparatus for securing an automotive chassis component to an automotive body. The apparatus comprises a vertically movable pallet, and a spindle extension mounted on the pallet generally perpendicularly thereto. The spindle extension includes a shaft, a bolt socket on an upper end of the shaft, and a driver socket on a lower end of the shaft. The spindle extension includes a spring operable between the shaft and the pallet which functions to normally bias the spindle extension to the generally perpendicular orientation relative to the pallet.
The spring can be a compression spring. The apparatus can include a housing mounted to the pallet. The spring can be positioned between the housing and the lower end of the shaft. The apparatus can include a bushing below the housing. The spring can be mounted on the bushing. The bushing can include first and second retainers thereon. The first retainer can be positioned at an upper end of the spring, and the second retainer can be positioned at a lower end of the spring.
The spring can be a tension spring. The spring can be positioned between the housing and the upper end of the shaft. The bushing can be above the housing. The spring can have an upper end secured to the bushing and a lower end secured to the housing.
The apparatus can include a handle mounted to the shaft to enable an operator to lower the spindle extension relative to the pallet from a raised position. A spring can be operable between said shaft and the pallet which functions to return the spindle extension to the raised position. The spring can be a compression spring. The spring can be operable between the shaft and the bushing.
These and other features and advantages of the present invention will become more readily apparent during the following detailed description taken in conjunction with the drawings herein, in which:
Referring first to
Referring now to
Spring 40 can be a compression spring. A housing 42 can be mounted to the pallet 20 via screws 22. The spring 40 can be positioned between the housing 42 and the lower end of the shaft 32. A bushing 44 can be positioned to be below the housing 42. The bushing 44 can include first and second retainers 46, 48, respectively. The first retainer 46 can be positioned at an upper end of the spring 40 and the second retainer can be positioned at a lower end of the spring 40. As shown in
The spindle extension 30 can include a handle 50 mounted to the shaft 32. Handle 50 enables an operator to lower the spindle extension 30 relative to the pallet 20 from a raised position to place a bolt in bolt socket 34, and then to raise the spindle extension 30 relative to the pallet 20 so as to pass the bolt through the bolt hole of the chassis component carried by the pallet 20 to be secured to the body. Handle 50, when moved downwardly relative to pallet 20, causes shaft 32 to telescope downwardly through bushing 44. A spring, for example compression spring 52, operable between the shaft 32 and the pallet 20, can be included to return the spindle extension 30 to the raised position when an operator releases handle 50. An upper end of spring 52 can bear against a retainer 54 secured to shaft 32. A lower end of spring 52 can bear against a spacer 56, which itself can bear against bushing 44. Thus, downward movement of shaft 32 via handle 50 compresses spring 54 between retainer 54 and spacer 56; releasing handle 50 permits compression spring 52 to extend moving shaft 32 and bolt socket 34 to the original raised position.
Referring now to
Those skilled in the art will readily recognize numerous adaptations and modifications which can be made to the present invention and which can result in an improved spindle extension for securing automotive chassis components to automotive bodies, yet all of which will fall within the spirit and scope of the present invention as defined in the following claims. Accordingly, the invention is to be limited only by the scope of the following claims and their equivalents.
