US2048009A - Adjustable trestle - Google Patents

Description

l July 2l, 1936. J. F. KACENA 2,048,009

' ADJUSTABLE TRESTLE Filed April 12, 1935 rlll] l' Patented July 21, 1936 UNITED STATES:

PATENT `OFFICE'.

4 Claims.

An object of this invention is to provide a trestle which is readily adjustable for height, which is strong and self-supporting, and which may be folded into a small space for packing.

5 This and other objects, as will hereinafter appear, are accomplished by this invention which is fully described in the following specification and,

shown in the accompanying drawing, in which- Figure 1 is a side elevation of a trestle applied to one end of a beam;

Fig. 2 is a front elevation of the same;

Fig. 3 is a partial enlarged section on the line 3-3 of Fig. 2;

Fig. 4 is an enlarged partial vertical section on the line 4--4 of Fig. 2;

Fig. 5 is an enlarged section on the line 5 of Fig. 1;

Fig. 6 is an enlarged section on the line 6 of Fig. 2; and 20 Fig. 7 is a partial front elevation of a modified form of the trestle.

l The embodiment shown in Figs. 1 to 6 inclusive comprises an A-frame I composed of two sloping side members II, I2, and a horizontal bar I3 secured thereto at intermediate points. A vertical brace member I4 rests upon the horizontal bar I3 and is secured thereto by means of a rivet I (Fig. 4). This angle lies between the members II, I2 and is secured thereto by means of rivets I6.

The laterally extending leg of the vertical brace member I4 is preferably provided with two hooks I'I (Fig. 4) which are struck outwardly from the metal of the angle in order to pass through any one of several spaced openings I8 in a vertical standard I9, which is preferably in the form of a channel. A means for clamping the vertical standard to the vertical brace member is provided in the form of a bolt passing through one of the openings I8 and through an opening in an angle 2I, which is secured to the vertical member YI4 as by means of rivets 22. A wing nut 23 serves to tighten this bolt.

The vertical standard carries at its upper end two clamping fingers 24 which are preferably channels and connected to the member I9 by means of rivets 25, so that these fingers lie on each side of a Wood beam 23. A clamping bolt 21 passes through these clamping fingers causing them to bend inwardly to rmly grip the beam. A diagonal brace 28 is pivotally connected to the vertical standard by means of a rivet 29 and carries a clamp 30 (Fig. 5) at its outer end. This clamp firmly grips the lower portion of the wood beam and serves to stiifen the trestle.

In order to make each trestle self-supporting I have provided two legs 3l which are hingedly secured to the vertical brace member I4 by means of a rivet 32. A connecting link 33 is pivotally connected at one end by means of 5 a rivet 34 to one of these legs, and has a series of notches 35 which are adapted to engage a rivet 36 in the other leg. When so engaged, as shown in Fig. 1, these legs can no longer be spread and the legs then serve to support the l0 trestle. These legs are made adjustable to permit of use of the trestle on an uneven floor. They also serve to take some of the load off the other portions of the A-frame.

In Fig. 7 is shown a modified form of the de- 15 vice in which the A-frame is made up of a single member 31 preferably of channel section having a horizontal brace member 38 secured thereto as in Fig. 2. A vertical brace member 39 is then set in between the members 31 and 38 and secured as 20 before by rivets, welding, or the like.

In both forms, the A-frame is very strong and rigid as the members I3 and 38 are connected to the legs close to the base and the vertical brace members are secured at the bottom to these and at the top to the top of the legs. This gives a firm anchorage for the bottom of the diagonal brace 38, so that the whole trestle when assembled is very solid and substantial.

While I have shown and described but a few embodiments of my invention, it is to be understood that it is capable of many modifications. Changes, therefore, in the construction and arrangement may be made which do not depart from the spirit and scope of the invention as disclosed in the appended claims.

I claim:

1. In an adjustable trestle, a rigid A-frame having a horizontal bar and a vertical brace member, a hook and a clamp on the vertical brace 40 member, and a vertically adjustable standard having a series of spaced openings for adjustably engaging the hook and the clamp for holding the standard clamped to the vertical brace member, and a lateral brace member secured to the vertical brace member and adapted to engage the iioor to maintain the A-frame in an upright position.

2. In an adjustable trestle, a rigid A-frame having a horizontal bar and a vertical brace member, a hook and a clamp on the vertical brace member, and a vertically adjustable standard having a series of spaced openings for adjustably engaging the hook and the clamp for holding the standard clamped to the vertical ard having a series of spaced openings for adjust-` ably engaging the ho'ok and the clamp for hold ing the standard clamped to the vertical brace member, yieldable clamping ngers riveted to the top of the standard, and a clamp for drawing the fingers together for gripping the Y 4. In an adjustable trestle, a rigid A-frame having a horizontal bar and a vertical brace member, ahook and a clamp on the vertical brace member, and a vertically adjustable standard having a series of spaced openings for adjustably 5 engaging the hook and the clamp for holding the standard clamped to the vertical bracemember, yieldable clamping fingers at the top of the standard, one secured on each side of the standard by rivets, and a clamp for drawing the fingers 10 together for gripping the beam. Y

` JOSEPH F. KACENA.

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