US1929251A

US1929251A - Doorcheck

Info

Publication number: US1929251A
Application number: US434726A
Authority: US
Inventors: Wallace F Moore
Original assignee: American Hardware Corp
Current assignee: Emhart Industries Inc
Priority date: 1930-03-10
Filing date: 1930-03-10
Publication date: 1933-10-03
Anticipated expiration: 1950-10-03

Description

Oct. 3, 1933. w. F. MOORE 1,929,251

DOORGHECK Filed March 10, 1930 INVENTOR H"? WaZ/aca/Y'Moore BY awgi fiz/ ATTORNEYS 50 a small port 16.

Patent ed Oct. 3, 1933 4 UNITED STATES DOORCHECK I 7 Wallace F. Moore, New Britain, Conn., assignor to The American Hardware Corporation, New Britain, Conn., a corporation of Connecticut Application March 10, 1930. Serial No. 434,726

2 Claims.

v My invention relates to door checks and has special reference to door checks of the type in which there is provision of means capable of being adjusted to permit the door to close rapidly .5 until it is nearclosing position and then to finally close the door slowly, and has for its object to provide a novel and improved check of this character.

In the accompanying drawing,

Figure 1 is a side elevation, partly in section,

of a portion of a door check embodying the features of my invention in their preferred form;

Fig. 2 is an end view of'the check; Fig. 3 is a detail sectional view taken on the .15 line 3-3 of Fig. 2;

125 or cylinder 2, a chamber 4 for the usual door closing spring (not shown), a piston 6 mounted within the cylinder and adapted to move in one direction during the closing of the door and in the opposite direction during the opening of the door, the piston being provided with the usual opening controlled by a ball check valve 8. The piston chamber is provided with a by-pass 10 extending longitudinally in the wall thereof having its inner end arranged back of the piston and its outer end adapted to be in communication with the piston chamber through a port 12 arranged close to the end wall of the piston chamber. The port 12 is adapted to be opened and closed varying degrees by means of a valve 14 41) of a common construction extending into the outer end of the by-pass 10.

The parts above referred to may be of a well known construction.

In accordance with the present invention a 4,5 by-pass 15 is provided in the wall of the piston chamber parallel with the by-pass 10. This by-pass 15 has its inner end arranged back of the piston and its forward end adapted to be in communication with the piston chamber through The port 16 is spaced a distance inwardly from the port 12 and is adapted to be closed by the piston as the door approaches closed position. A cylindrical valve member 18 extends through a bore in the outer end of the piston chamber and its inner end portion extends into the outer end of the by-pass 15. The valve -member 18 is provided with a collar 20 which is held against a shoulder in the bore through which said member extends by a packing washer '22 and a packing nut 24 screwed into the outer vat) end of said bore. With this construction, the valve member may be turned but is held axially fixed, and a tight joint is provided. The outer end of the valve member is provided with a screw-driver slot 26.

The inner end portion of the valve member is provided with an axial bore 28 and an aperture is made through the valve member so as to provide diametrically arranged ports 30 leading outwardly from the inner end of the bore 28.17. The ports 30 of the valve member are so arranged that upon turning the valve so as to position the ports horizontally one or the other of them registers with the port 16 in the piston chamber, thus opening communication between the piston 175 chamber and the outer end of the by-pass 15. Upon turning the valve member 18 from this position approximately ninety degrees, both of the ports30 are positioned out of alinement with the ports 16 and thus the by-pass 15 is closed.

The screw-driver slot 26 on the outer end of the valve member 18 is so arranged with relation to the ports 30 that when the slot is in horizontal position the by-pass 15 is open, and when said slot is in vertical position the by-pass is closed. Thus one may easily determine the distance to turn the valve member 18 in either direction to open and close the by-pass 15.

With this construction upon turning the valve member 18 so as to open the bypass 15 and '90 properly adjusting the valve 14, as the door is closed the fluid in advance of the piston is permitted to pass more or less freely out through the ports 12 and 16 so that the door may close rapidly, but when the door approaches closed position, the piston closes the port 16 whereupon all the liquid must pass out through the port 12 so that the door may be caused to finally close slowly.

With the construction above described, a simple and efiicient means adapted to be accurately adjusted is provided for effecting the desired result, namely, to cause the door to close rapidly until it approaches close to closed position and to finally close slowly.

As the two regulating valves are located in .105 separate passes, the adjustment of one valve will not afiect the flow through the other by-pass. By providing the two diametrically arranged ports 30, the valve member may be turned in either direction to open and close the valve, and the position of the valve is determined by the position of the screw-driver slot therein, so that no difficulty may be experienced in adjusting the valve correctly.

In place of the diametrically opposed ports 30 and axial bore in the valve member, longitudinally extending grooves 31 may be provided in the valvemember, the grooves being arranged diametrically opposite each other (Fig. 6).

As will be evident to those skilled in the art, my invention permits various modifications without departing from the spirit thereof or the scope of the appended claims.

What I claim is:

1. In a door check the combination of a piston, a piston chamber having a by-pass leading from one end of the cylinder to a point back of the piston, a valve in said by-pass for controlling the flow of fluid therethrough, said chamber having a second by-pass separate from the first-mentioned by-pass opening into the cylinder at a :point back of the piston, a port leading from the interior of said chamber to the second-mentioned by-pass and arranged a distance inwardly from the outer end of said first-mentioned by-pass, a valve extending into the second-mentioned bypass having a central bore and diametrically artioned by-pass opening into the cylinder at a point back of the piston, a port leading from the interior of said chamber to the second-mentioned by-pass and arranged at a point spaced a distance inwardly from the outer end of said first-mentioned by-pass, and a rotatable valve member held from axial movement constructed so when turned in either direction into one angular posi- .tion opens communication between the secondmentioned by-pass and its said portand when turned substantially ninety degreesjfrom said angular position in either directioncloses communication between the seconde'mentioned by-pass and its said port.

WALLACE F. MOORE.