US734204A - Gage for screw-drivers. - Google Patents

Description

No. 734,204. PATBNTED JULY 21, 1903.

W. H. VOSS.

GAGE EoR scREw DRIVERS.

I APPLICATION IILE'D NOV. 19, 1902.

H0 MODEL.

WIN

ii awlllm Patented. July 21, 1903.

PATENT OFFICE.

WILLIAM H. VOSS, OF DAVENPORT, IOWA.

GAGE FOR SCREW DRlV ERS.

SPECIFICATION forming part of Letters Patent No. 734,204, dated July 21, 1903.

Application filed November 19, 1902. Serial No. 131,937. (No model-l 'To all whom it may concern:

Be it known that 1, WILLIAM H. Voss, a citizen ofthe United States, and a resident of Davenport, in the county of Scott and State of Iowa, have invented certain new and useful Improvements in Gages for Machine or Hand Screw-Drivers, of which the following is a full, clear, and exact description of the same.

Myiuvention relates to screw-drivers; and its principal object is to provide a suitable gage whereby the depth to which a screw is driven thereby into a piece of wood or other material can be regulated by a simple and easy preadjustment of its parts and whereby the pointed end of the screw-driver is guided to its workand the relative position of the screw while being operated upon is maintained. This I accomplish by means which present no external projection to interfere with the comfortable manipulation of the same and by means which can be readily taken apart or assembled together without inconvenience easily and quickly.

I will first describe my invention in connection with the accompanying drawings, forming a part of this specification, and will then point out more particularly in the claims the features of novelty.

In the drawings, Figure l is aside elevation of my invention as it is applied to the stem of an ordinary screw-driver. Fig. 2 is a longitudinal central section of the same.

A represents the straight stern of an ordinary screw-driver, the screw-engaging end of which is of the usual flattened construction, and B represents a holder. This holder is preferably of a cylindrical shape. The diameter of the lower portion of its bore is such that the lower part of the stem has sliding contact therewith and its movement is guided thereby, and the upper portion of the bore (forming about two thirds its length) is greater in diameter and forms an annular chamber I), through which said stem extends centrally. The upper end of chamber 1) is closed ,bya bushing G, which is secured in fplace by the screws 0 c, tapped through the walls of the holder into-the same, and this bushing closes snug around the sides of the stem and forms'a guide in the upper end of the holder for the same.

Secured fast to the barrel of the stem in chamber 1) by means of the set-screws d dis an adjustable collar D, and between this collar and the lower end of chamber 1) the stem A is surrounded by a coiled expansion-spring E, the oftice of which is to automatically return the stem to the limit of its upward or return movement when the pressure exerted to drive a screw is removed. At a suitable distance above the upper end of the holder B the stem has secured thereto, by means of set-screws g g, the adjustable gage-collar G, which determines the extent to which the stem of the screw-driver can be moved to its work, and consequently the depth to which the screw can be driven into the material designed to receive it.

It will be observed that the collar D and the collar G determine and limit the movement of the screw-driver stem and that the extent of this movement can be practically regulated within a distance corresponding to the length of the annular chamber 1) less the length of the runner D. It will also be noticed that by means of my invention the extent to which the screws are driven, especially upon work where it is desirable that the screws should always enter the material just so far, can be predetermined to a nicety. In order to accommodate the head of the screw being operated upon the lower end of the bore of the holder is made larger, and the walls of this enlargementmay be either cylindrical or beveled, substantially as shown in the drawings, in dotted lines in the former case and in solid lines in the latter case.

My invention can be used either in conjunction with hand or machine screw-drivers, and when used as a hand screw-driver the holder affords a comfortable grasp for the hand and one that will present no projections of any kind to harass and annoy the operator.

What I claim as new is-- 1. The combination with a screw-driver of a gage comprising a case having a bore with an enlarged upper end and a removable bushmg in said upper end, the bore and said bushing being adapted to receive the stem of the driver and allow longitudinal movement therein, means for normally retaining the stem in its upper position, and a gage-collar attached to the stem and adapted to engage the contiguous end of the case when the stem 'is at the limit of its driving movement.

2. The combination with a screw-driver of a gage comprising a case through which the stem of the screwdriver has longitudinal movement and adjustable devices, one within and the other outside of said case, for limiting the movement of said stem.

3. The combination with a screw-driver of a gage comprising a case through which the stem of the screw driver has longitudinal

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