US1179220A - Bolt-clipper. - Google Patents

Description

F. A. ROBERTS.

BOLT CLIPPER.

APPLICATION HL'ED AUG-5.1915.

.lnvenfor. Frederick A. Hoberfs bYJa/lX MkW ATT'ys THE COLUMBIA P-LANOGRAPH cD., WASHINGTON, D. c

FREDERICK A. ROBERTS, OF SOMERVILLE, MASSACHUSETTS.

'BOLT- CLIPPER.

Specification of Letters Patent.

Patented Apr. 11, 1916.

Application filed August 5, 1915. Serial No. 43,859.

To all whom it may concern Be it known that I, FREDERICK A. ROB- ERTS, a citizen of the United States, residing at Somerville, county of MiddleseX, State of Massachusetts, have invented an Improvement in Bolt-Clippers, of which the following description, in connection with the accompanying drawing, is a specification, like characters on the drawing representing like parts.

This invention relates to bolt clippers and has for its objects to provide an improved bolt clipper which can be inexpensively manufactured and embodies a simple construction and which has other features of improvement, all as will be more fully hereinafter described and then pointed out in the appended claim. 1

Referring to the drawings, Figure 1 is a plan view of a pair of bolt clippers embodying my invention; Fig. 2 is a section on the line 22, Fig. 1; Fig. 3 is a section on the line 33, Fig. 1; Fig. 4 is a section on the line 44, Fig. 3; Figs. 5 and 6 are side and edge views of the intermediate adjusting member.

My improvements relate to bolt clippers of that known type which involve a pair of handle members 1 pivotally connected together at 2 and a pair of cutting jaws 3 and 4 that are pivotally connected by bolts 5 with cross straps 6 and are also pivotally connected by bolts 7 with intermediate adjusting members 8 that in turn are pivoted to the handle members 1 at 9 and 10, respectively. Bolt clippers of this general construction are now commonly used. My improvements relate particularly to the intermediate adjusting members 8 and their manner of connection with the handle members 1. These intermediate adjusting members are for the purpose of providing means for adjusting the cutting edges 3 and 4 so that when the handles 1 are closed together with the stops 11 in engagement the cutting edges 12 of the cutting jaws will be shut together, as shown in Fig. 1.

In my improvement, each intermediate adjusting member 8 is formed at one end with the female portion 18 between the arms of which the end of the cutting jaw is received, the pivotal bolt 7 extending through the arms of the portion 13 and the end of the cutting jaw. Each of these pivot bolts 7 is shown as screw-threaded at one end, as at 14, said screw-threaded end having screwthreaded engagement with one of the arms of the female portion 13 of themember 8. The other end of each member 8 is formed with the male projection or portion 15 which is entered in a recess '16 formed between the two sides or checks 17 of the handle 1. The bolts 9 and 10 which connect the adjusting members 8 to the'handle'levers 1' extend through the sides or cheeks 17 and the male portion 15 of thelintermediate adjusting member 8. Each intermediate member is provided with a set screw 18 which is screw-threaded therethrough and is adapted to engage a shoulder or projection 19 formed on the handle member 1 thereby to adjust the position of the intermediate member 8 relative to'the handle member 1. By manipulating the adjusting screws 18 the position of the intermediate members 8 relative to the handle members 1 can be changed, thus varying the relative position of the pivot bolts 7. This adjustment provides means by which the positions of the cutting jaws may be changed as desired to take up wear and to keep said jaws in proper relative position.

When the device is in use the intermediate adjusting members 8 are intended to maintain a fixed position relative to the handle levers l as determined by the adjustment of the adjusting screws 18, the ends of the latter being maintained against the abutment surfaces 19. The resistance of the bolt or other article being cut will hold the inter mediate adjusting members 8 in this position during the cutting operation. When the handle levers 1 are separated, however, to open the jaws 3 and 4 any resistance to the opening movement of the jaws would tend to swing the adjusting members 8 about their pivotal bolts 9 and 10 so as to separate the adjusting screws 18 from the abutment surfaces 19. In order to prevent this I propose to make the .bolts 9 and 10 of special construction, as best seen in Figs. 2 and 3.

Each bolt is provided centrally with a screw-threaded portion 20 that screws into the male end 15 of the intermediate adjusting member and each bolt is also provided with the plane or smooth portions 21 and 22 that extend through the cheeks 17 of the handle members. The screw-threaded portion 20 of the bolt 9 is right-handed, while the screw-threaded portion of the bolt 10 is left-handed. When these pivotal bolts 9 and 10 are inserted in place and screwed up tight the action of the screw-threaded portions thereon will be to draw tightly together the face of the male portion 15 and the inner face 24 of one of the ears 17, thus providing a frictional engagement between these faces which is suflicient to resist any tendency of the member 8 to swing outwardly when the handle levers 1 are separated to open the jaws. By making the screw-threaded bolt 9 a right-hand screw thread and that of the bolt 10 a left-hand screw-thread, any tendency of either member S to swing outwardly when the jaws are open will serve to clamp the faces 24. and 25 still tighter together, thus making a rigid connection between the member 8 and the handle member 1. It will thus be seen that I provide a bolt clipper which has the usual provision for adjusting the intermediate adjusting members 8; which has such a construction that the necessary rigid connection between the intermediate members 8 and the handle levers 1 is secured without the use of any auxiliary parts other than the pivot bolts 9 and 10 which are necessary to form a connection between the members 8 and the handle levers 1. The construction of the device is thus simplified and cheapened.

Another advantage of the construction is that the device can be readily taken apart because all of the joints are made by means of removable bolts instead of rivets.

I claim:

In a bolt clipper, the combination with pivotally-connected handle levers, of cutting levers,.intermediate adjusting members pivotally connected to the cutting levers and each provided with a male portion which is received in a recess formed in the corresponding handle lever, and a bolt extending through the walls of each recess said bolt being screw threaded a part of its length removed from both ends of the bolt, said screw threaded portion having engagement with the male portion of the adjusting member received therein, the screw-threads of one bolt being right hand and those of the other left-hand whereby a rigid connection between the adjusting members and the handle levers is maintained when the handle levers are separated to open the cutting levers.

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

FREDERICK A. ROBERTS.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. 3.

Images