US2102264A - Tool retainer for portable power driven tools - Google Patents

Description

Dec. 14, 1937.

a o o o r J F. HAAS TOOL RETAINER FOR PORTABLE POWER DRIVEN TOOLS Filed May 19, 1934 35 :1 g0 57 Z35 a0 55 5Q 14; v H as J 2 Z1 y 217 g I ll g5 J5 ""1 J6 Patented Dec. 14, 1937 'rooL' RETAINER Fo PORTABLE POWER DRIVEN 'rooiis Joseph F. Haas, Forest Park, Ill., assignor to Wodack Electric Tool Corporation, Chicago,

111., a corporation of Illinois Application May 19, 1934, Serial No. 726,515

5 Claims.

The invention relates generally to portable power-operated tools and more particularly to a tool retaining device therefor.

The primary object of the invention is to provide a tool retainer for drills, hammers and the like, which is of simple construction and adapted for easy and convenient manipulation.

Another object is to provide a tool retainer having an improved form of locking sleeve advantageously associated with the barrel of the tool and the retaining member mounted thereon.

Another object is to provide a device of this character having a locking sleeve which is resiliently urged into locking position, whereby to simplify the insertion and removal of the tool.-

A further object is to provide a resilient support for the retaining 'member to cushion the shock on the retaining member of the tool in its reciprocation.

Other objects and advantages will become apparent from the following description taken in connection with the accompanying drawing, in

which: 1

Figure 1 is a side elevation of hammer embodying the features of the invention.

Fig. 2 is an enlarged fragmentary sectional view taken on the line 2-2.

Fig. 3 is an enlarged fragmentary perspective view of a part of the hammer shown in Fig. 1.

Fig. l is an enlarged fragmentary perspective view of another part of the hammer shown in Fig. 1.

Fig. 5 is a fragmentary sectional View similar to Fig. 2 but showing a modified form of hammer.

My invention is applicable to portable power driven tools of the type employing a reciprocatory tool element, and I have herein shown by way of illustration an electric hammer having a main body portion 6 equipped with'an attach ment 1 embodying a reciprocating mechanism for applying successive power impulses to a shank 8 of a star drill 9. Said attachment 1 is constructed to provide a barrel ID for receiving the shank 8 of the drill 9, and my invention particularly concerns the provision of means of an advantageous character for retaining the drill 9 in operative position in the barrel Ill.

Of primary importance in the provision ,of

such means is simplicity of construction and ease of manipulation. Accordingly, it is desirable that the number of parts be reduced to a minimum and that the number of manipulations necessary to effect the insertion and removal of the tool be small so as to simplify these operations.

Furthermore, it is desirable that the parts he I 7 associated in a compact relation so as to avoid undue bulk and at the same time provide a strong and rugged structure.

a To obtain these advantages, I employ a single arcuate retaining member H which is capable of being positioned in operative relation to the end i of the barrel in by a mere lateral movement of the member, and I provide a simple locking means for this retaining member comprising a single sleeve I2 slidable directly on the end of the barrel and preferably spring-pressed into encircling relation to the retaining member I I.

The retaining member H is slightly elongated in form and as viewed in Fig. 4 is approximately U-shaped, being formed with an open side which is of sufiicient width at its rear end to receive the nose of the barrel when the member is moved laterally relative to the barrel, and of sufficient width at its forward'end to receive the shank of the drill 9 when the latter is in position in the barrel. To ,hold the member against movement reciprocation of the drill.

For the sake of compactness and ease of assembly of the parts,'the nose I! of the barrel is preferably made of considerably smaller diameter than the barrel proper and constructed from a separate piece of hardened steel which is inserted into the end of the barrel, and which has a central opening shank of the tool.

l8 (Fig. 3) to receive the To secure the nose piece IT in position, it is formed with a rear threaded portion l9 engaging with internal screw threads in the end of the barrel.

The nose piece is of integral construction and the groove 14 is formed therein between'two integral collars 20 and 2|, the collar 20 being of a diameter corresponding approximately with the diameter of the barrel Hi, and the collar 2l'of considerably smaller diameter as determined by the thickness of the wall of the arcuate member |.I as shown clearly in Fig. 2. By this construction, the rear portion of the arcuate retaining member is of a diameter substantially conforming to the diameter of the barrel, 10.

To enable the nose piece H to be engaged by a wrench or the like, the opposite sides of the collar 20 may be flattened as shown in Fig. 3.

The locking sleeve 12 is slidable' directly on the barrel [8 and has a forward tapered end portion 28 which, in the operative position of the sleeve, encircles the rear end portion of the arcuate retaining member in closely fitting relation to the outer peripheral surface thereof. To hold the sleeve yieldably in such operative position, a light coiled spring 22 is provided, and in order that this spring may be positioned around the barrel, wholly within the sleeve, the latter has its rear end portion counter-bored so as to be slidable over a collar 23 formed integral with the barrel l9. V for the rear end of the spring 22, and a corresponding opposed shoulder 25 is formed in the sleeve at the forward end of the counter-bored portion thereof. Said shoulder 25 is formed by an annular flange 25 projecting a short distance inwardly and alsoproviding a shoulder 21 adapted to engage with the rear side of the collar 20 which, for this purpose, projects slightly beyond the barrel proper. Itwill be understood that the spring is constantly under slight compression so as to urge the sleeve continuously in a forward direction or into operative or holding relation with respect to the arcuate retaining member I l, the sleeve being limited in such.

movement by the shoulder 2'l'an'd collar 20.

In the'modifled form of the device shown in Fig. 5, the retaining member,. indicated at 30, has a resilient connection withthe barrel in order to cushion the shock on the retainingmember of the tool 9 in its reciprocation. To this end, the nose of the barrel has a two part construction, one part 3| being rigidly secured in the barrel and the other part 32 being resiliently supported thereby. The part 3| preferably is threaded into the barrel proper to receive the shank 8 of the tool and is provided with a collar. 33 abutting the end of the barrel and: extending lateral' ly beyond the barrel to providea shoulder 34. The resiliently mounted part 32,;comprises a sleeve portion 35 surrounding thezendof the barrel, and an end portion 36 provided with an annular groove 31 to receive the inwardly turned flange on the retaining member, The sleeve portion 35 at its rear end has a collar 38 threaded thereon, and a coiled compression spring 40, enclosed by the Sleeve portion bears against the collar 38 and the shoulder 34 to resiliently resist outward movement of part 32.

'The locking sleeve, indicated at 4|, in this form of the device, is slidably mounted on the resiliently mounted part 32, so that movement of the part 32 will not cause a release of the retaining member. The locking sleeve, as in the other form of the device, is urged to a position holding the retaining member in place by a coiled spring 42 enclosed by the locking sleeve. The spring 42 bears at one end against'the collar 38 and at the other end against a shoulder 43 formed by an internal flange 44 on the locking sleeve. To prevent the locking sleeve from being forced off the end of the barrel by the spring 42, the outer face of the internal flange 44 is adapted to abut against an external flange 45 on the resiliently mounted part 32. To avoid dropping the retaining member 30 when it is removed, a short piece of chain 46 may be attached thereto and to the barrel, the chain having suflicienfi slack to permit the retaining member to be easily Withdrawn. T

This collar 23 provides a shoulder 24 In the operation of inserting or removing a tool, the operator grasps the sleeve l2 with the fingers of one hand and slides it rearwardly on the barrel against the action of the spring 22 until the tapered forward end portion 28 of the sleeve clears the'retaining member. Thereupon, the said member I I may be readily withdrawn by the fingers of the other hand from its nose H, to disengage the flange i3 from its groove 54 in the nose. The drill 9 may then be removed or inserted, as the case may be, and the arcuate retaining member readily slipped back into place with one hand while the other hand holds thesleeve 12 in withdrawn position. Finally, a mere release by the operator of the sleeve it to the action of the spring 22 will result in a movement of the sleeve by the spring into operative or looking relation with the retaining member. Thus, in this operation, only two movements are required and only two parts necessary to be held by the operator. In addition, the. construction is exceedingly simple and yet it has been found to be very efiectual in. retaining the drill in position. Finally it will be observed that the retain ing device does not add materially to. the bulk. of the tool at the noseend thereof, and that. the parts are capable of being easily and cheaply assembled.

In the form of the device shown in Fig. 5, the operation of inserting or removing the tool is the same as in the form shown in Figs. 1 to 4. The retaining member 30, however, is supported by the part 32 which is resiliently, supported on the end of the barrel. Thus, when the tool is driven outwardly in the reciprocation; thereof, the shock on the retaining member is cushioned by the spring 40. The locking sleeve 4|, being mounted on the resiliently mounted part 32, will move with said part on any movement thereof involved in the cushioning of the retaining member, so. that the locking sleeve will not release the retaining member because of the cushioning movement.

r I claim as my invention;v

1. In a portable power driven tool having a barrel and a toolreciprocable in one end thereof, means for removably retaining'the tool in position in the barrel comprising an arcuate retaining member having inturned flanges at opposite ends for respectivelyengaging the barrel and the tool, said barrel having a part provided with a groove to receive one flange of said retaining member, said part being resiliently mounted on the barrel proper to cushion the shock on said retaining member of the reciprocable movement of the tool, and disengageable means resiliently urged into locking position for locking the retaining member in position on the end piece.

2. In a portable power driven tool having a barrel and a tool reciprocable in one end thereof, means for retaining the tool in position in the barrel comprising an arcuate retaining member having inturned flanges at opposite ends for respectively engaging the barrel and the tool, said barrel having a nose comprisingtwo parts resiliently connected, one of said parts being rigid with the barrel proper and shaped to receive the shank of the tool, and the other part having a groove to receive the flange on the retaining member, and disengageable means-for locking the retaining member in position on the barrel.

3. In aportable power driven tool having a barrel and a tool reciprocable in one end thereof,

a nose mounted in the end of the barrel com prising two parts, one rigid with the barrel and the other resiliently carried by the barrel, said tool and said resilient part respectively having spaced annular grooves, a substantially U-shaped member having inwardly turned flanges engageable with said grooves by a lateral movement of the member, and a slidable locking sleeve surrounding the barrel and normally having one end encircling the retaining member to hold it in engaged position.

4. In a portable power driven tool having a barrel and a tool reciprocable in one end thereof, means for retaining the tool in position in the barrel comprising an arcuate member having a pair of inturned flanges one of which is engageable with said tool, said barrel having a nose for positioning the tool in the barrel and including a resiliently mounted part provided with a groove for receiving the other flange on the retaining member and comprising a sleeve surrounding the end of the barrel, a spring ensaid sleeves and acting therebetween to hold the forward end of said locking sleeve in encircling relation to the retaining member.

5. In a portable power driven tool having a barrel and a tool reciprocable in one end thereof,

means for retaining the tool in position in the barrel comprising an arcuate retaining member engageable with said tool by a lateral movement, said barrel having a resiliently mounted part engaged by said retaining member by the lateral movement thereof and adapted to cushion the shock on the retaining member of the reciprocable movement of the tool, and means carried by said part for locking the retaining member in position thereon and on the tool, said means being slidable on said part to release said retaining member,

JOSEPH F. I-IAAS.

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