US1713819A - Cushion cap for tools - Google Patents

Description

y 21, 1929 A J. B. ammo-r 1,313,819

CUSHION CAP FOR TOOLS Filed March 16, 1928 12 In vemor: l- John B. Ora/00f.

9% g M Hi5 Aitamey ATE t OFFICE.

JOHN B. CROFOOT, OF MOUNT PROSPECT, ILLINOIS.

CUSHION CAP FOR TOOLS.

Application filed March 16, 1928. Serial No. 262,254.

My invention relates to cushion caps for tools and more particularly to a cushion cap for stapling machines, having for its objectthe provision of a device of the kind described of comparatively simple yet efficient construction, and particularly adapted to provide the maximum in the way of a shock lbsorbing medium for the hand of the iperator.

Other objects and advantages of the nethod and construction herein employed will appear more fully in the accompanying :pecification and drawings.

In the drawings,

Figure 1 is a side elevation of the em- )odiment of my invention.

Figure 2 is a plan View thereof.

Figure 3 is a section taken on line 33 )f Figure 1, looking in the direction of the rrrows.

Referring more particularly to the drawngs wherein similar characters of reference ndicate corresponding parts in the several iews, 5 designates the upper body portion )f a stapling machine having an operating read 6 resiliently supported by a coil spring seated in a recess 8 formed in the collar 9, he latter having a hole 10 in the base theref to receive the square plunger shank 11 ntegral with the head 6 and slidable in a quare groove 12 in the end wall 13 of the tapling machine. The above described elenents form no part of my invention, being nerely detailed for the purpose of more learly setting forth the functions and mode f operation of my cushion cap when used herewith.

My invention comprises the cap B which s preferably made of comparatively soft =lastic rubber formed to provide upper cup hapcd recess 13 having a dome shaped cov r 14 with a central orifice 15. The bottom RE the cap B has a circumferential flange .6 which is flared to receive and clampingly grasp the head 6 of the stapling tool. As )est shown in Figure 3, it will be seen the )ottom of my cushion cap is configured to rovide a shallow recess 16' suitable for'the eception of the manipulating head of a taplingmachine or other type of percusion tool. On further reference to figure L, it will be seen that my cap which is ormed by the molding process has thickned walls 17, 18 at the point of greatest tress.

The function and mode of operation of my cushion cap has been in large measure indicated by the foregoing description, but will be made more fully apparent by the following brief explanation. In use, the flange 16. of the bottom socket or recess is flexed over the operating head of the desired tool which in this case is a stapling machine. To operate the tool, the dome shaped top 14 of the cap B may now be forcibly struck, thereby operating the plunger shank 11, which serves as the hammer, for the purpose of driving the staple through the papers to be attached. The recess or air pocket 13, it will be observed, is closed when the palm or fist lies over the orifice 15, whereby a full pneumatic shock absorbing action is secured. By experience I have found the walls 17 and 18 to be those points most susceptible to breakage, due to the flexure of these parts, and I have accordingly reinforced or thickened these points sufliclently to overcome this defect while still permitting the desired flexibility to the covering member 14.- for the purpose of securlng the pneumatic effect alluded to.

I am aware of the use of cushion caps for stapling machines, but I have found the 1 conventional caps now in use either susceptible to early breakage or else insufliciently elastic to permit long continued operation of tools of this type without injury or pain to the operator.

The cushion cap embodying my invention maybe used over long periods of time with out inconvenience or pain to the operator by reason of the mechanical advantages inherent in its structure, as set forth above.

IVhile I have described and illustrated a preferred form of my invention, it will be understood that minor changes and varia-- tions may be made therein, without departing from the spirit or scope of my inventin; hence I do not confine myself literally to the details as set forth, but desire to take advantage of such variations and modifications as fairly lie within the provinceof the appended claims.

vVhat I claim as new and desire to secure by Letters Patent is:

1. A cushion cap for tools comprising a unitary rubber structure formed to provide a bottom socket with an outwardly and inwardly. projecting circumferential wall for attachment to a tool head, and an upwardly and inwardly projecting wall forming an air cushion pocketon the top of said cap,

said upwardly and inwardly projecting wall having a cegltral air supply aperture communicating with said pocket, said aperture being of a size adapted to be closed by the hand of an operator when striking said cushion cap immediately over the aperture, whereby the supply of air Within the pocket is temporarily confined and compressed to serve as a cushioning means until the hand of the operator is removed, substantially as described.

2. A cushion cap for percussion tools and the like, comprising a unitary rubber structure molded to provide a cushioning pocket having a flared upwardly and inwardly projecting peripheral wall with an air supplying aperture on the top thereof, and an integral socket on the bottom of said cap, said socket being formed by a downwardly and inwardly projecting wall providing a clamping means to secure a'tool head within said socket, said air supplying aperture being temporarily cl sed when the hand of an operator strikeg the said upwardly and inwardly projec ing peripheral wall, whereby the supply of air Within the said cushioning pocket is temporarily confined and compressed until the hand of the said operator is removed.

In testimony whereof I have signed my name to this specification.

JOHN B. OROFOOT.

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