US1301567A - Punch-press guard. - Google Patents

Punch-press guard. Download PDF

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Publication number
US1301567A
US1301567A US23907918A US23907918A US1301567A US 1301567 A US1301567 A US 1301567A US 23907918 A US23907918 A US 23907918A US 23907918 A US23907918 A US 23907918A US 1301567 A US1301567 A US 1301567A
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United States
Prior art keywords
punch
press
plunger
arm
guard
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Expired - Lifetime
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US23907918A
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John M Jelsema
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Individual
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16P—SAFETY DEVICES IN GENERAL; SAFETY DEVICES FOR PRESSES
    • F16P3/00—Safety devices acting in conjunction with the control or operation of a machine; Control arrangements requiring the simultaneous use of two or more parts of the body
    • F16P3/02—Screens or other safety members moving in synchronism with members which move to and fro
    • F16P3/04—Screens or other safety members moving in synchronism with members which move to and fro for machines with parts which approach one another during operation, e.g. for stamping presses
    • F16P3/06—Screens or other safety members moving in synchronism with members which move to and fro for machines with parts which approach one another during operation, e.g. for stamping presses in which body parts of the operator are removed from the danger zone on approach of the machine parts
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00—Machine element or mechanism
    • Y10T74/21—Elements
    • Y10T74/2193—Guard mechanisms
    • Y10T74/2194—Automatic
    • Y10T74/2196—Reciprocating member actuator

Definitions

  • My invention relates to improvements 1n guards for use upon punch presses to avert the danger of injuring the hands of the operator when operating the press for punch press work, and its object is, to so time and operate the guard that it will, invariably, push the hand of the operator from under the punch before the punch can possibly catch the hand or finger of the operator.
  • FIG. 1 is a front elevation of the upper end of a punch press.
  • Fig. 2 is a sectional plan of the same shown below the line 2-2 of Fig. 1, and, Fig. 3 is an elevation of the actuating rack detached from the press.
  • 1 represents the press frame
  • 2 is the plunger shaft
  • 3 is the plunger head
  • 4 is the fly wheel
  • 5 is the plunger proper
  • 6 is the press bed
  • 7 is a supporting girt secured to the frame of the press for the support of the shaft that carries the pinion 9 and the guard head 10.
  • the guard consists of a swlnging arm 11, that is mounted in the head 10, which latter is journaled to the girt 7, and has, connected therewith, the gear wheel 9, so located and mounted that when the lunger 5 is forced downward the rack 8 W111 be drawn downward with it and, acting upon the gear wheel 9, will cause it to revolve and to throw the arm 11 around into the position indicated by its dotted lines to the left of Fig. 1.
  • the cross-head 16, carrying the plunger 5 is made to travel upon the guide-ways or slides 15, in the usual manner.
  • 17 is the spring case for the safety lock 18, and 19 is the lock clutch mounted in the driving wheel 4:.
  • the plunger 5 cannot be moved either upwardly or downwardly without actuating the guard 11 to swing it from side to side as indicated, and at such times as to absolutely guard the hand of the operator against any possible chance of accident to the operator, such as are common upon unguarded punch presses.
  • this guard is actuated wholly by the vertical movement of the press plunger, it does not cease to work when the trip pedal is not operated, as in case the fly wheel be comes set upon the shaft, the brake band is set, or broken, or gets loose, or the breaking of the latch bracket, or other accident whereby the plunger will continue to operate after the foot is removed from the clutch pedal, thus rendering it a perfectly reliable guard against injury to the operator of a punch press.
  • a girt secured to the frame of the press front of the plunger, an arm pivotally mounted near one end at the longitudinal center of the girt, a gear wheel con nected with the pivotal element of the arm, and a rack connected with the plunger in position to operate the gear wheel to swing the arm from side to side by the vertical reciprocations of the plunger.
  • a girt secured across the frame front of the plunger, an arm pivotally mounted, at one end, to the longitudinal center of the girt, a gear wheel mounted upon the pivotal element of the arm, a rack connected with the plunger in position to engage the gear wheel and cause it to revolve with the vertical movement of the plunger to swing the arm from side to side, and a spring actuated buffer pivotally mounted near the lower end of the arm.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Portable Nailing Machines And Staplers (AREA)

Description

J. M. JELSEMA.
PUNCH PRESS GU'ARD.
APPLICATION FILED iUNE B. 1918.
1,801,567., Patented Apr. 22, 1919.
72st 1. If
1 /1 11 MQJQHQMEL JOHN M. JELSEIVIA, 0F GRAND RAPIDS, MICHIGAN.
PUNCH-PRESS GUARD.
Specification of Letters Patent.
Patented Apr. 22, 121.9.
Application filed June 8, 1918. Serial 11' 0. 239,079.
To all whom it may concern:
Be it known that I, JOHN M. JELSEMA, a citizen of the United States, residing at Grand Rapids, in the county of Kent and State of Michigan, have invented certain new and useful Improvements in Punch-Press Guards, of which the following is a specification.
My invention relates to improvements 1n guards for use upon punch presses to avert the danger of injuring the hands of the operator when operating the press for punch press work, and its object is, to so time and operate the guard that it will, invariably, push the hand of the operator from under the punch before the punch can possibly catch the hand or finger of the operator.
I attain this object by the mechanism and construction shown in the accompanying drawing, in which Figure 1 is a front elevation of the upper end of a punch press. Fig. 2 is a sectional plan of the same shown below the line 2-2 of Fig. 1, and, Fig. 3 is an elevation of the actuating rack detached from the press.
Similar reference numerals indicate similar parts throughout the several views.
In the drawings 1 represents the press frame, 2 is the plunger shaft, 3 is the plunger head, 4 is the fly wheel, 5 is the plunger proper, 6 is the press bed, 7 is a supporting girt secured to the frame of the press for the support of the shaft that carries the pinion 9 and the guard head 10. The guard consists of a swlnging arm 11, that is mounted in the head 10, which latter is journaled to the girt 7, and has, connected therewith, the gear wheel 9, so located and mounted that when the lunger 5 is forced downward the rack 8 W111 be drawn downward with it and, acting upon the gear wheel 9, will cause it to revolve and to throw the arm 11 around into the position indicated by its dotted lines to the left of Fig. 1.
The cross-head 16, carrying the plunger 5, is made to travel upon the guide-ways or slides 15, in the usual manner.
To avert the danger of injuring the hand of the operator by a sudden stroke of the arm 11 I have pivoted a flexible wing 12 to the.arm, as at 14:, and hold it, normally, away from the end of the arm by means of a very flexible spring, as 13.
17 is the spring case for the safety lock 18, and 19 is the lock clutch mounted in the driving wheel 4:.
With the construction shown and described it is readily seen that the plunger 5 cannot be moved either upwardly or downwardly without actuating the guard 11 to swing it from side to side as indicated, and at such times as to absolutely guard the hand of the operator against any possible chance of accident to the operator, such as are common upon unguarded punch presses.
As this guard is actuated wholly by the vertical movement of the press plunger, it does not cease to work when the trip pedal is not operated, as in case the fly wheel be comes set upon the shaft, the brake band is set, or broken, or gets loose, or the breaking of the latch bracket, or other accident whereby the plunger will continue to operate after the foot is removed from the clutch pedal, thus rendering it a perfectly reliable guard against injury to the operator of a punch press.
What I claim as new in the art is:
1. In combination with a punch press and its plunger, a girt secured to the frame of the press front of the plunger, an arm pivotally mounted near one end at the longitudinal center of the girt, a gear wheel con nected with the pivotal element of the arm, and a rack connected with the plunger in position to operate the gear wheel to swing the arm from side to side by the vertical reciprocations of the plunger.
2. In combination with the frame, plunger and several elements of a punch press, a girt secured across the frame front of the plunger, an arm pivotally mounted, at one end, to the longitudinal center of the girt, a gear wheel mounted upon the pivotal element of the arm, a rack connected with the plunger in position to engage the gear wheel and cause it to revolve with the vertical movement of the plunger to swing the arm from side to side, and a spring actuated buffer pivotally mounted near the lower end of the arm.
Signed at Grand Rapids, Michigan, June 1, 1918.
JOHN M. JELSEMA.
Copies oi this patent may be obtained for five cents each, by addressing the Commissioner of Patents,
Washington, D. G.
US23907918A 1918-06-08 1918-06-08 Punch-press guard. Expired - Lifetime US1301567A (en)

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US23907918A US1301567A (en) 1918-06-08 1918-06-08 Punch-press guard.

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US23907918A US1301567A (en) 1918-06-08 1918-06-08 Punch-press guard.

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US1301567A true US1301567A (en) 1919-04-22

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2727408A (en) * 1952-09-15 1955-12-20 Jr George R Isaac Safety device for punch presses

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2727408A (en) * 1952-09-15 1955-12-20 Jr George R Isaac Safety device for punch presses

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