US748879A - of toronto - Google Patents

Description

PATENTED JAN. 5,1904.

G. E. B. PARKIN.

SCREW DRIVER.

APPLICATION FILED MAR. 27. 1903.

UNITED STATES 3 Patented January 5, 1904.

PATENT OFFICE.

GEORGE EDWARD BLIGH PARKIN, OF TORONTO, CANADA, ASSIGNOR TO ALEXANDER DOUGLAS FISHER, OF TORONTO, ONTARIO, CANADA.

SCREW-DRIVER.

SPECIFICATION formingpart of Letters Patent No. 748,879, dated January 5, 1904;.

Application filed March 2% 1903. Serial No. 1491 2 (N m -l To all whom it may concern:

Be it known. that I, GEORGE EDWARD ABLIGH PARKIN, traveler, a subject of the King tion is to design a device of this class by means of which the screw will be yieldingly held and guided, so that same will be screwed into the wood in a straight position, and to rotate the screw-chamber with the driver, so that the supporting members for the screws will not be bent out of alinement.

The construction and operation of my improved screw-driver will be fully set forth and described in the annexed specification and drawings.

Figure 1 is a general perspective view of my screw-driver. Fig. 2 is alongitudinal section through the chamber, showing construction of same. Fig. 3 is a longitudinal section through the chamber and supporting members used for so pporting the screw. Fig. 4 is an end view of the screw-driver, showing the head of the screw supported between the supporting members. Fig. 5 is an enlarged perspective view of one of the supporting members used for supporting the screw.

In the drawings like letters of reference indicate corresponding parts in each figure.

A is the chamber, which is preferably round and is provided with a suitable opening B, by means of which the screws are inserted thereinto. Near the outer end of this chamber the same is cut away on opposite sides, forming opening 0, in which operate the supporting ends D of the supporting members E, which are designed to support the screw. Upon referring to the drawings it will be noticed that the supporting members E are secured on the outside of the cham- A, so as to have yielding movement and normally rest parallel therewith.

The preferred form of construction for the supporting ends is as follows: In their normal position the inner edges (1 of the supporting ends D abut each other. These support- .struction.

ing ends are preferably formed integral with the body portions F and are constructed in a curved or hollowed-out manner, as shown at G, so as to ofier as little resistance as possible to the screw and to guide same into the passage-way H, formed by the V shaped grooves I of the said supporting ends. The said grooves need not necessarilybe made V- shaped. When the supporting ends are in their normai position, 'it will be understood that the longitudinal axis of their passageway H will be on a line with the longitudinal axis of the chamber A. I make the grooves in the supporting ends I) of sufficient length so as to hold the'screw in position. I preferably construct the sides of the V-shaped groovesIwith a editable taper, so as to better support the screws; but so constructing the said V-shaped grooves is not essential to the operation of this device. The end K of the chamber A extends a short distance beyond the ends of the supporting ends D, so as to prevent said supporting ends from coming in contact with the surface receiving the screw.

As shown in the drawings, I preferably secure the ends of the body portions F of the supporting members to the chamber A by means of a suitable ring L, brazed thereto, but of course do not confine myself to this manner of construction of attaching the said supporting members to said chamber.

M is the driving-bar provided with the usual beveled end N, which engages with the screw-head, so as to drive same into the wood. This driving-bar maybe of any suitable con- From my knowledge of the state of the art I know that there have been springs and spring -held jaws used for supporting the screws; but the means or supporting parts to which the said springs or spring-held jaws are secured do not rotate with the drivingbar. As is well known, the driving end of a screw-driver or a driving-bar is beveled. Gonseqnently by reason of the non-rotation of the supporting parts for the said springs or spring-held jaws the same are forced to spring outward and inward by reason of the action of this beveled end, consequently weakening same. As the beveled sides of the head of the driving-bar come in contact with the said springs or spring-held "jaws same has a tendency to bind against these screw-sup porting means,'so as to bend them out of alinement. By rotating the chamber A and the supporting members E with the driving-bar M, I entirely prevent any possibility of the beveled end Nfrom bending the said supporting members out of alinement.

I have constructed my device as follows in order to insure the chamber A and its connected parts turning with the driving-bar M. I also preferably construct my device so that the driving-bar cannot be withdrawn from the chamber A. The upper end of the chamber A is flattened on one side, thus providing a stop 0, against which a shoulder P, formed on the driving-bar, abuts. The driving-bar is constructed with a flat side Q, so that same may be readily operated within the chamber. This construction of the driving-bar will insure the chamber A turning therewith. It will be understood from Figs. 3 and 4 that the farther the screw is screwed into the wood the wider apart the supporting ends D are forced. As the head of the screw comes in contact with the supporting ends D same are forced apart into the position shown in Fig. 4, and as the end N of the driving-bar passes between said members the same are still farther forced apart, so as to permit the driving-bar to perform its function. The driving-bar is of course provided with any suitable handle R.

As the openings 0 are only of sufficient size as to permit the supporting ends D to freely operate therethrough, it will be understood that it is most important that the chamber A rotate with the driving-bar M. Were the chamber A held stationary, the action of the beveled end N would bend the supporting members E but of alinement, and thus prevent their operation.

I do not confine myself to the construction shown, by means of which the chamber A is made to rotate with the driving-bar M. It will be further understood that I can construct my screw-driver so that the parts will turn together without necessarily using a stop to prevent the driving-bar from being withdrawn from the chamber A.

I herein claim that I may make such alterations in the construction of my screw-driver that will not depart from the spirit of the invention.

What I claim as my invention is 1. A device of the class described, comprising a chamber provided with a side opening through which the screws are introduced thereinto, and two opposed openings constructed near its outer end. so that the end of said chamber will extend beyond the ends of the supporting members for the screw; supporting members, yieldingly secured on the outside of said chamber, and operating within same by means of said openings, so

as to hold the screw; a driving-bar operating 1 of the supporting members for the screw;

within said chamber so as to drive the screw; and means whereby the said driving-bar has only longitudinal movement in said chamber which must rotate therewith.

2. A device of the class described, com-' prising a chamber provided with a side opening through which the screws are introduced thereinto, and two opposed openings constructed near its outer end so that the end of said chamber will extend beyond the ends of the supporting members for the screw; supporting members, yieldingly secured on the outside of said chamber, and operating within same by means of said openings, so as to hold the screw; a driving-bar operating within said chamber so as to drive the screw; means whereby the said driving-bar has only longitudinal movement in said chamber which must rotate therewith, and means to prevent the driving-bar from being withdrawn from said chamber.

3. A device of the class described, comprising a chamber provided with a side opening through which the screws are introduced thereinto, and two opposed openings constructed near its outer end so that the end of said chamber will extend beyond the ends of the supporting members for the screw; supporting members, yieldingly secured on the outside of said chamber, and operating within same by means of said openings, so as to hold the screw; thesupporting ends of said supporting members being provided with slots which, at their inner end, open out in a curved construction G, the said slots together forming a common slot the longitudinal axis of which is on a line with the longitudinal axis of said chamber; a drivingbar operating within said chamber so as to drive the screw, and means whereby the said dri ving-bar has only longitudinal movement in said chamber which must rotate therewith.

4. A device of the class described, comprising a chamber provided with a side opening through which the screws are introduced thereinto, and two opposed openings constructed near its outer end so that the end of said chamber will extend beyond the ends of the supporting members for the screw; supporting members, yieldingly secured on the outside of said chamber, and operating within same by means of said openings, so as to hold the screw; a driving-bar operating within said chamber so as to drive the screw; the said chamber being constructed with a flattened portion and the said driving-bar being provided with a flat side so as to operate within said chamber and rotate same.

5. A device of the class described, comprising a chamber provided with a side opening through which the screws are introduced thereinto, and two opposed openings constructed near its outer end so that the end of said chamber will extend beyond the ends supporting members, yieidingly secured on the outside of said chamber, and operating within same by means of said openings, so

as to hold the screw; a. driving-bar operating within said chamber so as to drive the screw, the said chamber being constructed with a. flattened portion, which forms a stop, and the said driving-bar being provided with a. shoulder abutting said stop, one side of said 10 driving-bar being flattened so that it will GEORGE EDWARD BLIGH PARKIN.

Witnesses:

EGERTON R. CASE, A. D. FISHER.

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