US687401A

US687401A - Screw-driver.

Info

Publication number: US687401A
Application number: US4927501A
Authority: US
Inventors: Charles M Morse
Original assignee: Individual
Current assignee: Individual
Priority date: 1901-02-28
Filing date: 1901-02-28
Publication date: 1901-11-26
Anticipated expiration: 1918-11-26

Description

Nu. 687,40l. Patented Nov. 26, I901.

C. M. MORSE.

SCREW DRIVER.

(Application filed Feb. 28, 1901.)

(No Model.)

Zhvenwn UNITED STATES PATENT GFFICE.

CHARLES M. MORSE, OF PORTLAND, MAINE.

SCREW DRIVER.

SEECIFICATIOIN forming part of Letters Patent No. 687,401, dated November 26, 1901.

Application filed February 28, 1901. Serial No. 49,275. (No model.) 7

To all whom, it may concern:

Be it known that I, CHARLES M. MORSE, a citizen of the United States, residing at Portland, in the county of Cumberland and State of Maine, have invented certain new and useful Improvements in Screw-Drivers; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to improvements in screw-drivers, and is designed to enable the top of the handle to remain stationary in the hand while the rest of the handle, together with the blade, revolves. It is also designed to lessen the friction between the two parts by the interposition between them of ballbearings.

In the drawings herewith accompanying and making a part of this application, Figure 1 is a central vertical sectional view, partly in elevation, of my improved driver, and Fig. 2 is a plan view of the same, the top of the handle being removed, showing the plate secured to the handle and the ball-bearings.

Same letters of reference refer to like parts.

In said drawings, A represents the blade of a screw-driver, B the top of the handle, and O the main part, which is secured to the blade in any suitable manneras, for. example, by a pin 0 passing through the handle and blade, as seen in Fig. 1. Secured to the top of this part of the handle in any convenient manner, as by screws D, is a plate or disk E, having a circular channel or raceway F therein, adapted to receive a series of ballbearings G. The top 13 of the handle is secured to the part 0 in any convenient manner which will permit the part 0 to have free rotation relative to said part B. A convenient form is shown consisting of a threaded screw I, passing through the top and screwing into the disk E, as seen in Fig. 1. The part B may, if desired, be countersunk, as shown at H in Fig. 1, the sides extending below the top of the part G, as seen at J. It may also have a plate or disk K in the top, adapted to rest upon the ball-bearings. It will be evident that both of the disks referred to may be omitted,if desired,and the channel orrace- Way made in the Wood of the handle without altering the principle involved in my invention. The metal disks, however, serve to lessen friction and wear on the parts. The connecting-screw may be countersunk at the top and the hole filled with an insert L. The shank of the screw is not threaded and permits the rotation of the part 0 of the handle independently of the other part. The screwbolt serves only to hold the two parts together and does not serve as a pintle or pivot upon which one part turns. The balls in the circular race support the two parts of the handle on two sides of the screw, so that pressure on one edge of the top of the handle does not tend to upset it nor cause the top of the handle to press and bind against the screw. This is of the greatest importance, as a tendency to bind, although very slight, would prevent the desired result. The two parts must be perfectly free to revolve easily one with respect to the other without any tendency of the parts to bind. This result I obtain by supporting the parts on ballbearings arranged around on all sides of the connectingscrew.

The operation of my screw-driver is as follows: The blade is inserted in the head of the screw and the palm of the hand pressed against the part B in the usual manner, the fingers and thumb grasping the lower part of the handle. The blade and lower part of the handle are then turned by the fingers and thumb, the top remaining stationary relative to the hand. The driver works either way at will.

Having thus described my invention and its use, I claim- A tool-handle composed of wood and divided transversely, one of the adjacent faces being countersunk and the other having a corresponding raised portion,the one adapted to overlap the other, metallic plates interposed between the adjacent faces and .ballbearings interposed between said plates, the two parts of the handle being revolubly united.

. In testimony whereof I affix my signature, in presence of two witnesses, this 26th day of February, 1901.

CHARLES M. MORSE, Witnesses:

ELGIN C. VERRILL, MARION RICHARDS.