US352120A - Half to albeet e - Google Patents

Description

(No Model.)

0. F. DBARTH.

4 FLOOR CLAMP. N0. 352,120. Patented Nov. 9, 1886.

Witnesses C avwam coz N. PUERS. Phnln-Limn n hnr, Washin ton, D. C.

UNITED STATES PATENT OFFICE.

oHAELEs F. DEAETH, 01? EAST sANGEEvILLE, MAINE, ASSIGNOR OE NE HALF TO ALBERT E. DEARTH, or sAME rLAc FLOOR-QLAMP.

SPECIFICATION forming part of Lette s Patent No. 352,120, dated'November 9,1886.

Application filed June 15, 1886. Serial No. 205.257. (No model.)

To all whom it may concern.-

Be it known that I, GHAELEs F. DEARTH, a citizen of the United States, residing at East Sangerville, in'the county of Piscataquis and 5 State of Maine, have invented a new and useful Improvement in Floor-Clamps, of which the following is a specification.

My invention relates to an improvement in floor-clamps; and it consists in the peculiar construction and combination of devices, that will be more fully set forth hereinafter, and particularly pointed out in the claims.

This invention is an improvement upon the floor-clamp for which Letters Patent of the United States, No. 319,464, were granted to me June 9, 1885.

In'the drawings, Figure l is a perspective view of a floor-clamp embodying my improvements. Fig. 2 is a vertical longitudinal section. Fig. 3 is a transverse sectional view. Fig. 4is a detailed perspective view of the pawl or stop.

A represents a suitable base-plate, which is provided with vertical side arms, B, the said I 5 side arms being preferably cast with the baseplate and formed in a single piece therewith. In the sides of the base-plate, at one end thereof, are made longitudinal grooves 0, to receive tongues D, which project from the sides of a sliding plate, E. The said plate is provided on its upper side with a series of ratchet-teeth,

F, and to the front end of the sliding plate is I pivoted a bracket or head, G.

Hrepresents a bell-crank lever, which is piv-' oted between the upper ends of the side arm's, B. The short arm I of the bell-crank lever projects rearwardly from the upper end of the side arms, B, and to the same is connected a j ointed arm, K, by means of a link, L, which is connected at its lower end to the joints of the armK. The rear end of the said arm K is pivoted between vertical ears or lugs M, which are formed on the rear sides of the baseplate, and the front end of the jointed arm is.

5 adapted to engage the teeth of the sliding plate E.

N represents a pawl or stop comprising two parallel-arms, n, connected at their front ends by a cross-piece, a, which isinclined or set at an angle, and adapted to engage the teeth on the sliding rackplate E and hold the same against rearward movement. One of the arms at is A longer than the other and extends rearwardly from the pivotal point 0, and from the rear end of the said rearward extension of the arm projects a horizontal outwardl-y extending arm, M, which passes through a segmental slot bear upon the upper sides of the front ends of the arm n of the stop or pawl N.

' The base-plate A is provided on its under side, at the rear end thereof, with downwardlyextending spurs or studs i, which, when the device is operated, bear upon and enter the joist and prevent the device from moving rearwardly.

The operation of my invention is as follows: The floor-clamp is placed in position on the joist, with the pivoted bracket on the end of the sliding rack-platebearing against the board which is to be forced in position. The bellcrank lever is then raised, which causes the jointed arm to slide rearwardly upon the sliding rack-plate. The bell-crank lever is then lowered, which causes the jointed arm to straighten and move the sliding rack-plate forwardly. As the said plate is being moved forwardly the pivoted pawl or stop N is raised by the teeth of the same, and as soon as the bell-crank lever has been lowered sufficiently the pivoted stop or pawl engages the sliding ratchet-plate and prevents rearward movement of the same, thus holding the strip or board in position until the latter is nailed, after which the operator bears upon the arm n,which raises the pawl N from the ratchet-teeth of the sliding plate, and also raises the front end of the jointed arm K from the same, as before described, thus releasing the clamping-head G from the board which has been nailed in position, as will be very readily understood.

A floor-clamp thus constructed is very cheap and simple, is strong and durable, is thoroughly efficient in operation, and may be readily and easily operated.

Having thus described my invention, I claim- 1. The combination, in a flooring-clamp, of the sliding plate having the ratchet-teeth, the jointed arms engaging the said plate, the lever for operating the arm, and the pawl or stop pivoted to the frame, connected to the free end of the jointed engaging-arm, and having the arm n, by means of which the said pawl and jointed arm may be caused to disengage the ratchet-plate simultaneously, for the purpose set forth, substantially as described.

2. The combination of the base'plate A, having the side arms, B, one of the said arms being provided with the segmental slot, the sliding rack-plate secured in the base-plate and having the head G at its outer end, the jointed arm pivoted to the rear end of the baseplate and engaging the teeth of the sliding plate, the front end of the said jointed arm having the head or lug K, the bell-crank lever K, pivoted between the upper ends of the side arms, the link connecting the said lever to the jointed arm, and the stop or-pawl N, pivoted between the side arms, engaging the teeth of the sliding plate, and having the rearward-extending arm n, provided with the projecting arm n, which extends through the segmental slot in one of the side arms, thelug or head K of the jointed arm engaging thenpper side of the free end of the pivoted stop or pawl, for the purpose set forth, substantially as described.

In testimony that I claim the foregoing as my own I have hereto affixed my signaturein presence of two witnesses.

CHARLES F. DEARTH.

\Vi tn ess es:

0. A. MERRILL, F. W. KNOWLTON.

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