US2779089A - Puller tool having a manually operated sliding hammer - Google Patents

Description

Jan. 29, 1957 L. G. ALLEN FULLER TOOL HAVING A MANUALLY OPERATED SLIDING HAMMER Filed Oct. 20. 1952 2 Fig. l.

IN V EN TOR.

L'EO 5. ALLEN AGENTS United States Patent PULLER TOOL HAVING A MANUAI JLY OPERATED SLIDING HAMMER Leo G. Allen, SanDiego, Calif.

Application October 20, 1952, Serial N 315,653

1 Claim. (Cl. 29-254) The-present invention relates generally to puller tools and more particularly to a puller having opposed pivoted jaws Which can be adjusted for engaging and removing grease caps or the like, the device including a hammer slidably mounted on the shank of the tool, the tool being also used in installation and replacement of grease caps or the like.

The primary object of this invention is to provide a knock-oft puller adaptable for removing and replacing grease caps from automobile wheel hubs or the like without damaging the relatively thin walled caps.

Another object of this invention is to provide a knockoff puller having a clamp portion adjustable for grasping various sizes of grease caps or the like.

Another object of this invention is to provide a knockoff puller of the type described having a sliding hammer thereon to provide suflicient force of inertia for removing and replacing grease caps or the like.

Another object of this invention, ancillary to the preceding objects, is to teach the best known mode. of implementing the principles of the invention in carrying the invention into actual practice.

Another object of this invention is to provide a knockoii puller which is adapted for fabrication from many ditfei'ent materials, so that the choice of material can be according to the dictates of availability and price considerations, the exact sizes and proportions being matters easily determined to suit particular conditions and needs.

Another object of this invention is to provide a knockofi puller which is inexpensive and practicable to manufacture.

Finally, it is an object to provide a knock-01f puller of the aforementioned character which is simple, safe and convenient to operate, and which will give generally eflicient and durable service.

With these and other objects definitely in view, this invention consists in the novel construction, combination and arrangement of elements and portions, as will be hereinafter fully described in the specification, particularly pointed out in the claim, and illustrated in the drawing which forms a material part of this disclosure and wherein similar characters of reference indicate similar or identical elements and portions throughout the specifi cation and throughout the views of the drawing, and in which:

Fig. 1 is a side elevation view of the device.

Fig. 2 is a sectional view taken on the line 2--2 of Fig. 1.

Fig. device.

Referring now to the drawing in detail the device comprises a handle portion and a clamp portion 12. The handle assembly 10 comprises a shank 14 having a screw threaded portion 16 which is engaged with a screw threaded hole 18 in a handle 20. The hand grip 20 is secured to the outer end of the shank 14, and a plate-like hand shield 22 is secured at the inner end of the hand grip by means of a lock nut 24.

3 is an isometric view of the clamp portion of the 2,779,089 Patented Jan. 29, 1957 A hammer 26 is axially bored and slidably mounted on the shank 14,said hammer being of suitable heavy metal to provide considerable force of inertia when struck against the lock nut 24. The remaining end of the shank 14 is provided with a screw threaded portion 28 which is engaged with a screw threaded hole 30 in a bearing block 32, said bearing block being integrally formed with a cross bar 34 which is retained in position on the shank 14 by means of a lock nut 36.

The clamp portion 12 comprises jaws 38 and 40 each having a slot 42, the portions of the jaw on either side of the slot being lugs 44 which are outwardly bent normal at their ends to comprise hinge elements 46. The hinge elements 46 are pivotally mounted to terminal tongues 48 of the cross bar 34 by means of hinge pins 50, said tongues being a close fit within the slots 42 as illustrated in Fig. 3. The jaws 38 and 40 are bent at their other ends to form lips 52 which project on the opposite side of said jaws from the hinge elements 46, said lips having arcuate recesses 54 provided with serrations 56.

The jaws 38 and 40 are adjusted by means of a clamp screw 58 having a right hand threaded portion 60 and a left hand threaded portion 62 having the same pitch and of slightly smaller diameter than said right handed threaded portion. The clamp screw 58 is rotatably mounted in the bearing block 32 and is retained by a washer 64 secured against the shoulder 66, formed by the increase in diameter of said clamp screw at that position, and by a. washer 68 welded or suitably secured to the left hand threaded portion 62 as illustrated in Fig. 2. The clamp screw 58 is threadedly engaged with suitable nuts 70 and 72, each of said nuts having grooves 74 of such a depth that the nuts may be slidably fitted within the slots 42. The spacing of the roots of the grooves 74 is related to the Width of the slots 42 so that the nuts will be prevented from rotating, said grooves also being of sufficient width that the nuts 70 and 72 may remain in free alignment with the clamp screw regardless of the angular position of the jaws 38 and 40 during adjustment. The clamp screw 58 is further provided with a T-handle 76 secured in the right hand threaded portion 60 to provide sufficient leverage for adjusting the jaws 38 and 40.

To remove a grease cap, the device is placed with the jaws 38 and 40 on either side of said grease cap and the jaws are adjusted by means of the clamp screw 58 until the grease cap is firmly clamped between the lips 52. The hammer 26 is then repeatedly slid along the rod 14 striking the lock nut 24 thus providing a series of sharp pulls on the grease cap causing it to be removed from its seating. The fingers of the operator are protected from accidental blows of the hammer by the shield 22.

When the tool is used for installing or replacing a grease cap or other unit, the jaws are first clamped thereon and the hammer is reciprocated against the lock nut 36 to drive the unit into place without damaging it.

It will be obvious that the use of the device is not limited to the removal of grease caps but may also be applied to the removal of bearings, collars or the like, the versatility being limited only by the size and adjustment of the clamp portion.

The operation of this invention will be clearly comprehended from a consideration of the foregoing description of the mechanical details thereof, taken in connection with the drawing and the above recited objects. It will be obvious that all said objects are amply achieved by this invention.

Further description would appear to be unnecessary. It is understood that minor variation from the form of the invention disclosed herein may be made without departure from the spirit and scope of the invention, and

arrange that the specification and drawing are to be considered as merely illustrative rather than limiting.

I claim:

A puller tool comprising a bearing block, a handle fixed to said block, a cross bar having its central portion fixed to said block, opposing jaws pivoted to the ends of said cross bar, and a clamp screw having its center portion rotatably mounted in said block and having oppositely threaded end portions, of different diameters whereby a shoulder is defined between said portions said central por- 7 tion having said shoulder on one side of said block and a washer element secured to the smaller of said portions on the other side of said block in frictional abutment with said block whereby axial movement of the screw relative to the block is prevented, said jaws having opposed slots in portions thereof adjacent said cross bar, correspondingly threaded nuts being laterally grooved for a sliding fit in said slots, whereby said nuts are non-rotatively mounted in said slots, said nuts threadedly engaging said end portions and being somewhat loosely engaged in said slots to permit slight pivotal movement and thus to avoid binding, said slots being open at the ends of the jaws adjacent to said cross bar whereby the nuts are easily assembled onto the jaws during construction and repair means to rotate said screw to open and close said jaws, said handle including an elongated shank, a stop on the handle, said shank extending transversely of said screw from the side of said cross bar remote from said jaws, and a manually operable hammer mounted on said shank for sliding movement axially thereof and engageable with said stop.

References Cited in the file of this patent UNITED. STATES PATENTS

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