US918697A - Knife-switch handle. - Google Patents

Description

UNITED siratrns otARENcE, 1). am, or BRIDGEPORT, connncriou'r.

NiFE-swmorr HANDLE.

Torall'whom itmayroncern:

Be it known thatILQLARENoE D. PLATT, a citizen of the United States, residing at Bridgeport, county of- Fairfield, State of Connecticut, have invented anew and useful Knife-Switch Handle, of which the following is a specification. v i i i Thisinvention has for its obj set to provide a handle for knife switches which shall be especially adapted to meet; 'thjefrequire ments of this use. j i

It is of course well understood that knife switches are apt to be operated quickly and with considerable force and that relatively great strain is placed upon the handles which are apt to become loose and when referring to the accompanying drawing forming a portion of this specification and using reference characters to indicate the several parts.

Figure 1 is a plan view of the crossbar and blades of a knife switch with my novel handle in place thereon, partly in section, to show the construction and mode of attac iment to the handle; Fig. 2 a similar .view of thehandle detached, showing the use in co n nection therewith of a spring washer; and Fig. 3 is a section of the'cup-shaped spring washer detached. 7 j

10 denotes the crossbar and 1 1' the blades of a knife switch. V a

12 denotes the grip of the handle which is usually made of wood and may be of any ordinary or preferred configuration. At the inner end of the grip isthe usual hub 13 for the reception of a ferrule, indicated by 14. It will be noted that the ferrule is made wider than the height of the hub, the inner end of the ferrule resting against a shoulder 15 on the handle and theother end projecting outward beyond the hub-leaving, a recess .16 at the end of the handle. The grip is secured in place by means of a double screw indicated as a whole by 17. Theessentialffeatures of the screw are that the grip endthere Specification. of Letters Patent. un fication-filed; December 11,. 1908..

it the grips which are usually made of ?a.tented April 20, 1909. Serial No. 4%;994.

of has the configuration and thread of a wood screw, so-called, indicated by 18, the cross bar end thereofhas the thread of a metal screw, socalled, indicatedby 19, and inter- 'metal of: the screw or maybe-formed separate and-rigidly secured-thereto. This shoulwholly within the recess. If preferred, a cup-shaped spring washer 21 may be interposed between theshoulder' and the end of the hub of the grip. This washer when the grip is turned. to place on thread 18 is forced out flat, as shown in Fig. 2, the tension of the washer acting to make a perfectly tight joint between the hub of the gri and the shoulder. In shipping, the ban le is usually detached from the cross bar.

7 In setting up the switch for use, thread 19 is passed through the cross bar and the handle isretained in place by a nut 22, the nut being turned down tightly on the thread and drawing the end of the ferrule firmly against the cross bar but without contact of the shoulder with the cross bar. The action of the shoulder at all times is to prevent thread 18 from being forced downward into the grip with the necessary danger of s litting the grip. It will be obvious that w en the nut is tightened on'thread 19, the grip will be drawntoward the nut and the end of the ferrulewill be forced against the cross bar. The shoulder, however, cannot come in contact with the cross bar, consequently there will be no tendency to split the grip, nor can the grip be turned farther on to thread 18 as it is stopped by the shoulder. The bearing of the washer on the cross bar makes the handle and crossbar perfectly rigid and provides a maximum of strength to resist the strains of use butwithout the placing of any undue strain on the connection of the grip with the wood screw thread.

, Having thus described my invention, I claim: F

1. A knife-switch handle comprising a grip and ascrew having at one end a wood screw thread for engagement by the grip, at the other end a metal screw thread for engagethre'ads .a shoulderagainst which the end of the grip bears, substantially as described, for the purpose specified.

2. A knife switch handle comprisin a grip having at its inner end a hub and be ow the mediate threads 18 and 19 is a shoulder20 which may be formed by swaging up the" der is of less height thanrecess 16 so as to liementwitha cross bar and intermediate said.

hub a shoulder, a lerrule wider than the height of the hub and bearing against the shoulder leaving a recess at the end of the handle and a screw having at one end a wood screw thread for engagement by the grip, at the other end a gagement with a cross bar and intermediate said threads a shoulder against which the end of the grip bears and which lies wholly within the recess.

3. A knife switch handle com )rising a grip having at one end a hub, a ferrule wider than the hub whereby a recess is formed at the end of the handle, and a screw having at one end a wood screw thread for engagement by the grip, at the other end a metal screw thread metal screw thread for en- I I l for engagement with a cross bar and intermediate said threads a shoulder, and a spring washer lying between the shoulder and the i end of the handle.

4. knife switch handle comprising a grip having a hub, a ferrule wider than the hub, a double-ended screw one end of which is engaged by the grip and the other is adapted to engage a cross bar, said screw shoulder intermediate the threads within the ferrule the grip bears.

5. A knife switch handle comprising a grip and a screw having at one end a wood screw thread for engagement by the grip, at the other end a metal screw thread for engagement with a cross bar and intermediate said threads a shoulder, substai'itially as described, for the purpose specified.

in testimony whereof I allix my signature. in presence of two witnesses. V

CLARENCE D. PLAVI.

and lying against which the end of having a 3 5

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