US1417864A - Rim clamp - Google Patents

Description

G. V. SEARS.

RIM CLAMP. APPLICATION FILED SEPT. 14,1920.

1,41 7,86%, Patented May'30, 1922.

UNITED STATES PATENT OFFICE.

GEORGE V. SEAR-S, '0']? SALT LIJZECITY, UTAH.

331M CLAMP.

Application filed September 1 To (i/Z LU/1077b it may concern Be it known that I. Gnoncn V. Sirens, citizen of the United States, residing at Salt Lake City, in the county of Salt Lake and State 01 Utah, have invented certain new and useful Improvements in Him Clamps of which the following is a specification.

This invention relates to an improved rim clamp and has asone of its principal objects to provide a clamp particularly adapted for use in connection with a rim tool of the character shown in my pending application for rim contractor filed December 6, 1919, Serial No. 343,025.

A further object of the invention is to provide a rim clamp which maybe quickly engaged with or disengaged from a rim.

And the invention has as a still further object to provide a rim clamp which will, without mutilating the rim, efiectually grip the rim and coact therewith without slipping.

Other and incidental objects will appear hercinailter.

in the drawing:

Figure 1. is a fragmentary plan view showing a rim tool of the character illustrated in my pending application identified, equipped with the rim clamps ot the present invention, the clamps being shown engaged with a rim of conventional design.

Figure 2 is a fragmentary vertical sectional view through one of the clamps.

Figure 3 is a fragmentary perspective view showing the upper jaw block employed upon the clamp.

Figure 41 is a fragmentary perspective view showing; the lower jaw block of. the clamp, and

Figure 5 is a fragmentary perspective showing a slight modification of the invention.

Referring now more particularly to the drawings, I have in order to clearly bring out the function and operation of my improved rim clamp, shown the invention in connection with a rim tool as disclosed in my pending application previously noted. Briefly described, said tool includes coacting arms 10 and 11 respectively. The arm 10 carries a pinion 12 at its inner end while the arm 11 is provided with a rack coacting with said pinion, the arms being pivotally connected. Between the outer end portions of the arms extends a rack bar 13 and mounted. upon the arm 11 to coact with said Specification of Letters Patent.

areas. Serial No. noise.

bar is a pinion 1&1 which may be rotated by a crank 15. By turning this crank the arms may be swung; toward or away from each other for separating the ends oi a rim or drawing the rim ends together into overlappinp; relation, while by rotating the pinion 12, the arm 1.1 may be moved longitudinally relative to the 10 for shifting the rim ends out of register.

In carrying the present invention into etttect. each of the arms ltland 11 is as shown in Figure S2 tormed at its outer eu'l with :1 depending aw 16 through the inner end oi which is a vertical opening" 17 and upstandingilrom the arm is an arcuate flange 18 "forming a continuation of the wall of said opening above the arm. This flange is Formed upon its torwar-d side with arcuate teeth '19 located adjacent the upper end of the flange. At its free end the jaw is flanged to provide a seat 20 and engaging in said seat is a jaw block 21 detachahly secured n position by =cap belts or other fastoning devices 22. This block is provided in its upper edge with a straight substantially V-shaped slot 23. However. the walls o t said slot are. as will be observed, convex. li [ounte-d upon the fixed jaw 16 is a movable jaw 24:. This jaw is provided with an angularly disposed cylindrical shank 25 which is freely received through the opening 17 of the fixed jaw and is reduced at its lower end po1tioi1.,.a split ring; 26 being engaged through the lower end of said shank for detachably connecting: the movable jaw with the fixed jaw. Upon the rear side thereof. the shank. is provided with a series of teeth 27 to coact with the teeth 19 and termed on the jaw at its outer end is a socket 28. Threaded through the outer end wall of this socket is a screw shaft 29 equipped at its outer end with a turmng rod 30 slidable therethrough and swiveled upon the inner end. of said shar't is a cylindrical jaw block 31 Freely received within the socket to confront the jaw block 21 of the fixed jaw in coactingr relation. As best shown in Figure 2. the socket is formed at one side thereof with a rib 32 while the block is provided with a longitudinal groove to receive said. rib so that the block will thus be held against rotation. At its outer end the jaw block 31 is provided with a straight substantially V-shaped slot similar to the slot 23 of the block 21., the slot 33 having convex; Walls;

As will now be clear, the shank 25 of the jaw 24 may be positioned through the opening 17 of the fixed jaw for adjusting the movable jaw with respect to the fixed jaw so that the jaws may, as suggested in Figure 2, be arranged to embrace a vehicle wheel rim. The jaw block 21 may thus be engaged with one side flange of the rim so that the edge of said flange will. be received'within the slot 23, when the jaw block 31 may, by turning the shaft 29, be adjusted to engage the other side flange of the rim, the edge of this latter flange being received within the slot 33. Continued adjustment of the shaft 29 will then serve to tightly bind the jaw blocks in engagement with the rim. In this connection attention is directed to the fact flanges and since the slots are straight while the flanges are, of course, curved, the walls of each slot will coact with the inner and outer faces of the respective flanges at three points of contact, the outer walls of said slots engaging the outer faces of the flanges at points disposed substantially midway between the ends of said walls respectively, and the inner walls of the slots engaging the inner faces of the flanges atpoints dis-- posed adjacent the ends of theinner walls respectively. Further, attention is directed to the fact that the slot of the block 21 is considerably longer than the slot of the block 31 and since the block 31. is centered with respect to the block 21, the block 81 will coact with the adjacent rim flanges at a point disposed in a plane midway between the ends of the block 21 so that the .two blocks will thus have a three point gripping action tending to compress the side flanges of the rim therebetween. Slipping of the jaw blocks upon the rim to cause dislocation of the clamps will thus beeffectually overcome a11d, as will be observed, the jaws are of ample dimensions to accommodate various conventional types of rims. Shouldthe blocks 21. and 31 prove unsuitable for use in connection with, any particular type of rim, these blocksmay be readily removed and others substituted therefor, it being possible in this manner to readily adapt the device to different rims. In the drawing, a rim has been conventionally shown at 34 and in Figure 1 an ordinary pneumatic tire 35 is illustrated in position on the rim.

In Figure 5 of the drawings, I have illustrated a slight modification of the invention wherein the jaw 16 of the arm 10, as

illustrated in Figure 1, is provided at its inner edge with a laterally directed extension 36 through which is threaded. a set screw 3? adjustable to impinge the base of a rim for locking the rim clamp of the arm against slipping along the rim. Otherwise, this modified structure is identical with the preferred form of the invention.

Having thus described the invention, what is claimed as new is: v

1. A rim engaging clamp including a fixed jaw, a coacting movable jaw loosely connected with the fixed jaw but adjustable with respect thereto, and rim engaging means carried by the jaws and provided with straight rim edge receiving slots having convex walls.

In a rim clamp, the combination of a fixed jaw provided near its inner end with an opening and at its outer end with a seat, a stationary jaw block clamped in said seat, a movable jaw having a shank freely adjustable through said opening, a jawbloclr slidably adjustable upon the outer end of the movable jaw to coact with the stationary j aw block, the fixed jaw being provided with a lateral extension, and a set screw adjustable upon said extension in a plane at substantially right angles to the plane of said blocks.

In testimony whereof I aiiix my signature.

GEORGE v. SEARS. L. 8.1

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